21962636 has 12 divisors (see below), whose sum is σ = 38477040. Its totient is φ = 10969200.

The previous prime is 21962621. The next prime is 21962659. The reversal of 21962636 is 63626912.

It is a junction number, because it is equal to n+sod(n) for n = 21962596 and 21962605.

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, 1961 + ... + 6911.

It is an arithmetic number, because the mean of its divisors is an integer number (3206420).

Almost surely, 2^21962636 is an apocalyptic number.

It is an amenable number.

21962636 is a deficient number, since it is larger than the sum of its proper divisors (16514404).

21962636 is a wasteful number, since it uses less digits than its factorization.

21962636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6064 (or 6062 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 21962636 is about 4686.4310514506. The cubic root of 21962636 is about 280.0452137870.

The spelling of 21962636 in words is "twenty-one million, nine hundred sixty-two thousand, six hundred thirty-six".