21255022 has 8 divisors (see below), whose sum is σ = 32026176. Its totient is φ = 10579632.

The previous prime is 21255019. The next prime is 21255061. The reversal of 21255022 is 22055212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23383 + ... + 24274.

It is an arithmetic number, because the mean of its divisors is an integer number (4003272).

Almost surely, 2^21255022 is an apocalyptic number.

21255022 is a deficient number, since it is larger than the sum of its proper divisors (10771154).

21255022 is a wasteful number, since it uses less digits than its factorization.

21255022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47882.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 21255022 is about 4610.3169088469. The cubic root of 21255022 is about 277.0047308554.

The spelling of 21255022 in words is "twenty-one million, two hundred fifty-five thousand, twenty-two".