21413690 has 16 divisors (see below), whose sum is σ = 40220928. Its totient is φ = 8192976.

The previous prime is 21413677. The next prime is 21413719. The reversal of 21413690 is 9631412.

It is a super-2 number, since 2×21413690² = 917092238832200, which contains 22 as substring.

It is a Curzon 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, 46322 + ... + 46781.

It is an arithmetic number, because the mean of its divisors is an integer number (2513808).

Almost surely, 2^21413690 is an apocalyptic number.

21413690 is a deficient number, since it is larger than the sum of its proper divisors (18807238).

21413690 is a wasteful number, since it uses less digits than its factorization.

21413690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93133.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21413690 is about 4627.4928417016. The cubic root of 21413690 is about 277.6922996845.

The spelling of 21413690 in words is "twenty-one million, four hundred thirteen thousand, six hundred ninety".