21969064 has 16 divisors (see below), whose sum is σ = 44360820. Its totient is φ = 10139520.

The previous prime is 21969029. The next prime is 21969091. The reversal of 21969064 is 46096912.

It can be written as a sum of positive squares in 2 ways, for example, as 18576100 + 3392964 = 4310^2 + 1842^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105517 + ... + 105724.

Almost surely, 2^21969064 is an apocalyptic number.

It is an amenable number.

21969064 is an abundant number, since it is smaller than the sum of its proper divisors (22391756).

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

21969064 is a wasteful number, since it uses less digits than its factorization.

21969064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211260 (or 211256 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 21969064 is about 4687.1168110044. The cubic root of 21969064 is about 280.0725322298.

The spelling of 21969064 in words is "twenty-one million, nine hundred sixty-nine thousand, sixty-four".