21075250 has 32 divisors (see below), whose sum is σ = 45092736. Its totient is φ = 7225200.

The previous prime is 21075247. The next prime is 21075253. The reversal of 21075250 is 5257012.

It is an interprime number because it is at equal distance from previous prime (21075247) and next prime (21075253).

It is not an unprimeable number, because it can be changed into a prime (21075253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4272 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (1409148).

Almost surely, 2^21075250 is an apocalyptic number.

21075250 is an abundant number, since it is smaller than the sum of its proper divisors (24017486).

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

21075250 is a wasteful number, since it uses less digits than its factorization.

21075250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12067 (or 12057 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 21075250 is about 4590.7788010315. The cubic root of 21075250 is about 276.2215629703.

The spelling of 21075250 in words is "twenty-one million, seventy-five thousand, two hundred fifty".