21256862 has 8 divisors (see below), whose sum is σ = 34783992. Its totient is φ = 9662200.

The previous prime is 21256847. The next prime is 21256867. The reversal of 21256862 is 26865212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483089 + ... + 483132.

It is an arithmetic number, because the mean of its divisors is an integer number (4347999).

Almost surely, 2^21256862 is an apocalyptic number.

21256862 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21256862 is a deficient number, since it is larger than the sum of its proper divisors (13527130).

21256862 is a wasteful number, since it uses less digits than its factorization.

21256862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966234.

The product of its digits is 11520, while the sum is 32.

The square root of 21256862 is about 4610.5164569710. The cubic root of 21256862 is about 277.0127238526.

The spelling of 21256862 in words is "twenty-one million, two hundred fifty-six thousand, eight hundred sixty-two".