21454938 has 12 divisors (see below), whose sum is σ = 46485738. Its totient is φ = 7151640.

The previous prime is 21454903. The next prime is 21454943. The reversal of 21454938 is 83945412.

It can be written as a sum of positive squares in only one way, i.e., 20007729 + 1447209 = 4473^2 + 1203^2 .

It is a plaindrome in base 11.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 595953 + ... + 595988.

Almost surely, 2^21454938 is an apocalyptic number.

21454938 is an abundant number, since it is smaller than the sum of its proper divisors (25030800).

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

21454938 is a wasteful number, since it uses less digits than its factorization.

21454938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191949 (or 1191946 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 21454938 is about 4631.9475385630. The cubic root of 21454938 is about 277.8704864001.

The spelling of 21454938 in words is "twenty-one million, four hundred fifty-four thousand, nine hundred thirty-eight".