21368494 has 8 divisors (see below), whose sum is σ = 36631728. Its totient is φ = 9157920.

The previous prime is 21368489. The next prime is 21368497. The reversal of 21368494 is 49486312.

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

It is a super-2 number, since 2×21368494² = 913225071656072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21368497) 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, 763147 + ... + 763174.

It is an arithmetic number, because the mean of its divisors is an integer number (4578966).

Almost surely, 2^21368494 is an apocalyptic number.

21368494 is a deficient number, since it is larger than the sum of its proper divisors (15263234).

21368494 is a wasteful number, since it uses less digits than its factorization.

21368494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526330.

The product of its digits is 41472, while the sum is 37.

The square root of 21368494 is about 4622.6068403013. The cubic root of 21368494 is about 277.4967951365.

The spelling of 21368494 in words is "twenty-one million, three hundred sixty-eight thousand, four hundred ninety-four".