21255762 has 16 divisors (see below), whose sum is σ = 46376352. Its totient is φ = 6441120.

The previous prime is 21255761. The next prime is 21255791. The reversal of 21255762 is 26755212.

It is not an unprimeable number, because it can be changed into a prime (21255761) 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, 160963 + ... + 161094.

It is an arithmetic number, because the mean of its divisors is an integer number (2898522).

Almost surely, 2^21255762 is an apocalyptic number.

21255762 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21255762 is an abundant number, since it is smaller than the sum of its proper divisors (25120590).

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

21255762 is a wasteful number, since it uses less digits than its factorization.

21255762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322073.

The product of its digits is 8400, while the sum is 30.

The square root of 21255762 is about 4610.3971629351. The cubic root of 21255762 is about 277.0079454858.

It can be divided in two parts, 2125 and 5762, that added together give a palindrome (7887).

The spelling of 21255762 in words is "twenty-one million, two hundred fifty-five thousand, seven hundred sixty-two".