21387262 has 8 divisors (see below), whose sum is σ = 34548696. Its totient is φ = 9871032.

The previous prime is 21387257. The next prime is 21387277. The reversal of 21387262 is 26278312.

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, 411268 + ... + 411319.

It is an arithmetic number, because the mean of its divisors is an integer number (4318587).

Almost surely, 2^21387262 is an apocalyptic number.

21387262 is a deficient number, since it is larger than the sum of its proper divisors (13161434).

21387262 is a wasteful number, since it uses less digits than its factorization.

21387262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822602.

The product of its digits is 8064, while the sum is 31.

The square root of 21387262 is about 4624.6364181414. The cubic root of 21387262 is about 277.5780133987.

The spelling of 21387262 in words is "twenty-one million, three hundred eighty-seven thousand, two hundred sixty-two".