21927902 has 16 divisors (see below), whose sum is σ = 34424352. Its totient is φ = 10464480.

The previous prime is 21927889. The next prime is 21927911. The reversal of 21927902 is 20972912.

It is a super-2 number, since 2×21927902² = 961665772243208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1127 + ... + 6717.

It is an arithmetic number, because the mean of its divisors is an integer number (2151522).

Almost surely, 2^21927902 is an apocalyptic number.

21927902 is a deficient number, since it is larger than the sum of its proper divisors (12496450).

21927902 is a wasteful number, since it uses less digits than its factorization.

21927902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 21927902 is about 4682.7237800238. The cubic root of 21927902 is about 279.8975050029.

The spelling of 21927902 in words is "twenty-one million, nine hundred twenty-seven thousand, nine hundred two".