21437396 has 12 divisors (see below), whose sum is σ = 39490080. Its totient is φ = 10154520.

The previous prime is 21437371. The next prime is 21437407. The reversal of 21437396 is 69373412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140960 + ... + 141111.

It is an arithmetic number, because the mean of its divisors is an integer number (3290840).

Almost surely, 2^21437396 is an apocalyptic number.

It is an amenable number.

21437396 is a deficient number, since it is larger than the sum of its proper divisors (18052684).

21437396 is a wasteful number, since it uses less digits than its factorization.

21437396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282094 (or 282092 counting only the distinct ones).

The product of its digits is 27216, while the sum is 35.

The square root of 21437396 is about 4630.0535634051. The cubic root of 21437396 is about 277.7947348700.

The spelling of 21437396 in words is "twenty-one million, four hundred thirty-seven thousand, three hundred ninety-six".