101012121220 has 24 divisors (see below), whose sum is σ = 212167156824. Its totient is φ = 40396905216.

The previous prime is 101012121181. The next prime is 101012121233. The reversal of 101012121220 is 22121210101.

It can be written as a sum of positive squares in 4 ways, for example, as 26244 + 101012094976 = 162^2 + 317824^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 101012121220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391639 + ... + 596158.

It is an arithmetic number, because the mean of its divisors is an integer number (8840298201).

Almost surely, 2^101012121220 is an apocalyptic number.

101012121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101012121220 is an abundant number, since it is smaller than the sum of its proper divisors (111155035604).

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

101012121220 is a wasteful number, since it uses less digits than its factorization.

101012121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992919 (or 992917 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101012121220 its reverse (22121210101), we get a palindrome (123133331321).

The spelling of 101012121220 in words is "one hundred one billion, twelve million, one hundred twenty-one thousand, two hundred twenty".