21119956 has 24 divisors (see below), whose sum is σ = 43422624. Its totient is φ = 8861280.

The previous prime is 21119953. The next prime is 21119999. The reversal of 21119956 is 65991112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21119953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17890 + ... + 19033.

It is an arithmetic number, because the mean of its divisors is an integer number (1809276).

Almost surely, 2^21119956 is an apocalyptic number.

21119956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21119956 is an abundant number, since it is smaller than the sum of its proper divisors (22302668).

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

21119956 is a wasteful number, since it uses less digits than its factorization.

21119956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36951 (or 36949 counting only the distinct ones).

The product of its digits is 4860, while the sum is 34.

The square root of 21119956 is about 4595.6453300924. The cubic root of 21119956 is about 276.4167372441.

The spelling of 21119956 in words is "twenty-one million, one hundred nineteen thousand, nine hundred fifty-six".