21013497062400 has 528 divisors, whose sum is σ = 74304776164160. Its totient is φ = 5221623398400.

The previous prime is 21013497062399. The next prime is 21013497062407. The reversal of 21013497062400 is 426079431012.

It is not an unprimeable number, because it can be changed into a prime (21013497062407) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88893162 + ... + 89129238.

Almost surely, 2^{21013497062400} is an apocalyptic number.

21013497062400 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 21013497062400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37152388082080).

21013497062400 is an abundant number, since it is smaller than the sum of its proper divisors (53291279101760).

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

21013497062400 is a wasteful number, since it uses less digits than its factorization.

21013497062400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236190 (or 236167 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 21013497062400 in words is "twenty-one trillion, thirteen billion, four hundred ninety-seven million, sixty-two thousand, four hundred".