21013031430 has 48 divisors (see below), whose sum is σ = 55197140544. Its totient is φ = 5545704960.

The previous prime is 21013031411. The next prime is 21013031447. The reversal of 21013031430 is 3413031012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1194766 + ... + 1212225.

It is an arithmetic number, because the mean of its divisors is an integer number (1149940428).

Almost surely, 2^21013031430 is an apocalyptic number.

21013031430 is an abundant number, since it is smaller than the sum of its proper divisors (34184109114).

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

21013031430 is a wasteful number, since it uses less digits than its factorization.

21013031430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407101 (or 2407098 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21013031430 its reverse (3413031012), we get a palindrome (24426062442).

The spelling of 21013031430 in words is "twenty-one billion, thirteen million, thirty-one thousand, four hundred thirty".