21475964 has 24 divisors (see below), whose sum is σ = 40769568. Its totient is φ = 9858560.

The previous prime is 21475957. The next prime is 21475973. The reversal of 21475964 is 46957412.

It is a super-2 number, since 2×21475964² = 922434059458592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1064 + ... + 6639.

It is an arithmetic number, because the mean of its divisors is an integer number (1698732).

Almost surely, 2^21475964 is an apocalyptic number.

It is an amenable number.

21475964 is a deficient number, since it is larger than the sum of its proper divisors (19293604).

21475964 is a wasteful number, since it uses less digits than its factorization.

21475964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7765 (or 7763 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 21475964 is about 4634.2166544088. The cubic root of 21475964 is about 277.9612284835.

The spelling of 21475964 in words is "twenty-one million, four hundred seventy-five thousand, nine hundred sixty-four".