21269372 has 12 divisors (see below), whose sum is σ = 37415616. Its totient is φ = 10579200.

The previous prime is 21269359. The next prime is 21269401. The reversal of 21269372 is 27396212.

It is a happy number.

It is a congruent number.

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, 13004 + ... + 14547.

It is an arithmetic number, because the mean of its divisors is an integer number (3117968).

Almost surely, 2^21269372 is an apocalyptic number.

It is an amenable number.

21269372 is a deficient number, since it is larger than the sum of its proper divisors (16146244).

21269372 is a wasteful number, since it uses less digits than its factorization.

21269372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27748 (or 27746 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 21269372 is about 4611.8729384058. The cubic root of 21269372 is about 277.0670553210.

The spelling of 21269372 in words is "twenty-one million, two hundred sixty-nine thousand, three hundred seventy-two".