21949064 has 16 divisors (see below), whose sum is σ = 41352720. Its totient is φ = 10921680.

The previous prime is 21949051. The next prime is 21949069. The reversal of 21949064 is 46094912.

It is a super-2 number, since 2×21949064² = 963522820952192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21949069) 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, 4814 + ... + 8189.

It is an arithmetic number, because the mean of its divisors is an integer number (2584545).

Almost surely, 2^21949064 is an apocalyptic number.

It is an amenable number.

21949064 is a deficient number, since it is larger than the sum of its proper divisors (19403656).

21949064 is a wasteful number, since it uses less digits than its factorization.

21949064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13220 (or 13216 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21949064 is about 4684.9828174712. The cubic root of 21949064 is about 279.9875164502.

The spelling of 21949064 in words is "twenty-one million, nine hundred forty-nine thousand, sixty-four".