21293850 has 24 divisors (see below), whose sum is σ = 52809120. Its totient is φ = 5678320.

The previous prime is 21293803. The next prime is 21293861. The reversal of 21293850 is 5839212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70830 + ... + 71129.

It is an arithmetic number, because the mean of its divisors is an integer number (2200380).

Almost surely, 2^21293850 is an apocalyptic number.

21293850 is an abundant number, since it is smaller than the sum of its proper divisors (31515270).

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

21293850 is a wasteful number, since it uses less digits than its factorization.

21293850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141974 (or 141969 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 21293850 is about 4614.5259778226. The cubic root of 21293850 is about 277.1733027351.

The spelling of 21293850 in words is "twenty-one million, two hundred ninety-three thousand, eight hundred fifty".