21502005113430 has 48 divisors (see below), whose sum is σ = 56137185190944. Its totient is φ = 5710076040960.

The previous prime is 21502005113401. The next prime is 21502005113471. The reversal of 21502005113430 is 3431150020512.

21502005113430 is a `hidden beast` number, since 2 + 1 + 502 + 0 + 0 + 5 + 113 + 43 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21502005113394 and 21502005113403.

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, 495644634 + ... + 495688013.

It is an arithmetic number, because the mean of its divisors is an integer number (1169524691478).

Almost surely, 2^{21502005113430} is an apocalyptic number.

21502005113430 is an abundant number, since it is smaller than the sum of its proper divisors (34635180077514).

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

21502005113430 is a wasteful number, since it uses less digits than its factorization.

21502005113430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991332901 (or 991332898 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21502005113430 its reverse (3431150020512), we get a palindrome (24933155133942).

The spelling of 21502005113430 in words is "twenty-one trillion, five hundred two billion, five million, one hundred thirteen thousand, four hundred thirty".