21369458 has 8 divisors (see below), whose sum is σ = 34968240. Its totient is φ = 9713380.

The previous prime is 21369451. The next prime is 21369473. The reversal of 21369458 is 85496312.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21369451) 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, 485648 + ... + 485691.

It is an arithmetic number, because the mean of its divisors is an integer number (4371030).

Almost surely, 2^21369458 is an apocalyptic number.

21369458 is a deficient number, since it is larger than the sum of its proper divisors (13598782).

21369458 is a wasteful number, since it uses less digits than its factorization.

21369458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971352.

The product of its digits is 51840, while the sum is 38.

The square root of 21369458 is about 4622.7111092951. The cubic root of 21369458 is about 277.5009679916.

The spelling of 21369458 in words is "twenty-one million, three hundred sixty-nine thousand, four hundred fifty-eight".