21070523530780 has 72 divisors (see below), whose sum is σ = 45485729201808. Its totient is φ = 8198722478592.

The previous prime is 21070523530769. The next prime is 21070523530781. The reversal of 21070523530780 is 8703532507012.

It is a happy number.

It is a super-2 number, since 2×21070523530780² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070523530781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136466904 + ... + 136621216.

It is an arithmetic number, because the mean of its divisors is an integer number (631746238914).

Almost surely, 2^{21070523530780} is an apocalyptic number.

21070523530780 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 21070523530780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22742864600904).

21070523530780 is an abundant number, since it is smaller than the sum of its proper divisors (24415205671028).

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

21070523530780 is a wasteful number, since it uses less digits than its factorization.

21070523530780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159383 (or 159344 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 21070523530780 in words is "twenty-one trillion, seventy billion, five hundred twenty-three million, five hundred thirty thousand, seven hundred eighty".