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12021021012 = 223711136731487
BaseRepresentation
bin10110011001000001…
…00011100101010100
31011000202200010202110
423030200203211110
5144104340133022
65304500111020
7603614664330
oct131440434524
934022603673
1012021021012
11510960a010
1223b5995470
1311976148b0
148207307c0
154a552400c
hex2cc823954

12021021012 has 192 divisors, whose sum is σ = 37741584384. Its totient is φ = 2875944960.

The previous prime is 12021021007. The next prime is 12021021031. The reversal of 12021021012 is 21012012021.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8083333 + ... + 8084819.

It is an arithmetic number, because the mean of its divisors is an integer number (196570752).

Almost surely, 212021021012 is an apocalyptic number.

12021021012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021021012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18870792192).

12021021012 is an abundant number, since it is smaller than the sum of its proper divisors (25720563372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12021021012 is a wasteful number, since it uses less digits than its factorization.

12021021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198 (or 2196 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12021021012 its reverse (21012012021), we get a palindrome (33033033033).

The spelling of 12021021012 in words is "twelve billion, twenty-one million, twenty-one thousand, twelve".