21269976 has 64 divisors (see below), whose sum is σ = 65452800. Its totient is φ = 5609088.

The previous prime is 21269971. The next prime is 21269981. The reversal of 21269976 is 67996212.

It is an interprime number because it is at equal distance from previous prime (21269971) and next prime (21269981).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21269971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2686 + ... + 7053.

It is an arithmetic number, because the mean of its divisors is an integer number (1022700).

Almost surely, 2^21269976 is an apocalyptic number.

21269976 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21269976 is an abundant number, since it is smaller than the sum of its proper divisors (44182824).

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

21269976 is a wasteful number, since it uses less digits than its factorization.

21269976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9768 (or 9764 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 21269976 is about 4611.9384210980. The cubic root of 21269976 is about 277.0696779798.

The spelling of 21269976 in words is "twenty-one million, two hundred sixty-nine thousand, nine hundred seventy-six".