21356943102 has 36 divisors (see below), whose sum is σ = 50862477120. Its totient is φ = 6471800280.

The previous prime is 21356943067. The next prime is 21356943149. The reversal of 21356943102 is 20134965312.

21356943102 is a `hidden beast` number, since 213 + 5 + 6 + 9 + 431 + 0 + 2 = 666.

It is a super-2 number, since 2×21356943102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4900702 + ... + 4905057.

Almost surely, 2^21356943102 is an apocalyptic number.

21356943102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21356943102 is an abundant number, since it is smaller than the sum of its proper divisors (29505534018).

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

21356943102 is a wasteful number, since it uses less digits than its factorization.

21356943102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9805789 (or 9805775 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 21356943102 in words is "twenty-one billion, three hundred fifty-six million, nine hundred forty-three thousand, one hundred two".