21312201000 has 128 divisors (see below), whose sum is σ = 67749177600. Its totient is φ = 5575980800.

The previous prime is 21312200999. The next prime is 21312201017. The reversal of 21312201000 is 10221312.

It is a super-2 number, since 2×21312201000² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91981 + ... + 226019.

It is an arithmetic number, because the mean of its divisors is an integer number (529290450).

Almost surely, 2^21312201000 is an apocalyptic number.

21312201000 is a gapful number since it is divisible by the number (20) 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 21312201000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33874588800).

21312201000 is an abundant number, since it is smaller than the sum of its proper divisors (46436976600).

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

21312201000 is a wasteful number, since it uses less digits than its factorization.

21312201000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134116 (or 134102 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21312201000 its reverse (10221312), we get a palindrome (21322422312).

The spelling of 21312201000 in words is "twenty-one billion, three hundred twelve million, two hundred one thousand".