21352916 has 24 divisors (see below), whose sum is σ = 40412064. Its totient is φ = 9813600.

The previous prime is 21352913. The next prime is 21352921. The reversal of 21352916 is 61925312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352913) 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, 13991 + ... + 15441.

It is an arithmetic number, because the mean of its divisors is an integer number (1683836).

Almost surely, 2^21352916 is an apocalyptic number.

21352916 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21352916 is a deficient number, since it is larger than the sum of its proper divisors (19059148).

21352916 is a wasteful number, since it uses less digits than its factorization.

21352916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751 (or 1749 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 21352916 is about 4620.9215531104. The cubic root of 21352916 is about 277.4293454296.

The spelling of 21352916 in words is "twenty-one million, three hundred fifty-two thousand, nine hundred sixteen".