21341572120 has 128 divisors (see below), whose sum is σ = 56547072000. Its totient is φ = 7167086080.

The previous prime is 21341572069. The next prime is 21341572127. The reversal of 21341572120 is 2127514312.

It is a super-2 number, since 2×21341572120² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21341572127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257121 + ... + 329839.

It is an arithmetic number, because the mean of its divisors is an integer number (441774000).

Almost surely, 2^21341572120 is an apocalyptic number.

21341572120 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 21341572120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28273536000).

21341572120 is an abundant number, since it is smaller than the sum of its proper divisors (35205499880).

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

21341572120 is a wasteful number, since it uses less digits than its factorization.

21341572120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72793 (or 72789 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The spelling of 21341572120 in words is "twenty-one billion, three hundred forty-one million, five hundred seventy-two thousand, one hundred twenty".