21350964 has 12 divisors (see below), whose sum is σ = 49818944. Its totient is φ = 7116984.

The previous prime is 21350933. The next prime is 21350999. The reversal of 21350964 is 46905312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889612 + ... + 889635.

Almost surely, 2^21350964 is an apocalyptic number.

It is an amenable number.

21350964 is an abundant number, since it is smaller than the sum of its proper divisors (28467980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21350964 is a wasteful number, since it uses less digits than its factorization.

21350964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779254 (or 1779252 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 21350964 is about 4620.7103350026. The cubic root of 21350964 is about 277.4208913370.

The spelling of 21350964 in words is "twenty-one million, three hundred fifty thousand, nine hundred sixty-four".