21156350 has 12 divisors (see below), whose sum is σ = 39350904. Its totient is φ = 8462520.

The previous prime is 21156323. The next prime is 21156371. The reversal of 21156350 is 5365112.

It is a super-2 number, since 2×21156350² = 895182290645000, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 211514 + ... + 211613.

It is an arithmetic number, because the mean of its divisors is an integer number (3279242).

Almost surely, 2^21156350 is an apocalyptic number.

21156350 is a deficient number, since it is larger than the sum of its proper divisors (18194554).

21156350 is a wasteful number, since it uses less digits than its factorization.

21156350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423139 (or 423134 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 21156350 is about 4599.6032437592. The cubic root of 21156350 is about 276.5754203057.

The spelling of 21156350 in words is "twenty-one million, one hundred fifty-six thousand, three hundred fifty".