21357019502 has 32 divisors (see below), whose sum is σ = 41503526400. Its totient is φ = 8004248928.

The previous prime is 21357019493. The next prime is 21357019507. The reversal of 21357019502 is 20591075312.

It is a super-2 number, since 2×21357019502² (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 (21357019507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3084602 + ... + 3091517.

It is an arithmetic number, because the mean of its divisors is an integer number (1296985200).

Almost surely, 2^21357019502 is an apocalyptic number.

21357019502 is a deficient number, since it is larger than the sum of its proper divisors (20146506898).

21357019502 is a wasteful number, since it uses less digits than its factorization.

21357019502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6176160.

The product of its (nonzero) digits is 18900, while the sum is 35.

The spelling of 21357019502 in words is "twenty-one billion, three hundred fifty-seven million, nineteen thousand, five hundred two".