21250790 has 16 divisors (see below), whose sum is σ = 41729040. Its totient is φ = 7727520.

The previous prime is 21250787. The next prime is 21250793. The reversal of 21250790 is 9705212.

It is an interprime number because it is at equal distance from previous prime (21250787) and next prime (21250793).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96485 + ... + 96704.

It is an arithmetic number, because the mean of its divisors is an integer number (2608065).

Almost surely, 2^21250790 is an apocalyptic number.

21250790 is a deficient number, since it is larger than the sum of its proper divisors (20478250).

21250790 is a wasteful number, since it uses less digits than its factorization.

21250790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193207.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 21250790 is about 4609.8579153809. The cubic root of 21250790 is about 276.9863452109.

The spelling of 21250790 in words is "twenty-one million, two hundred fifty thousand, seven hundred ninety".