21097368 has 32 divisors (see below), whose sum is σ = 58604400. Its totient is φ = 7032384.

The previous prime is 21097337. The next prime is 21097369. The reversal of 21097368 is 86379012.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21097369) 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, 48621 + ... + 49052.

Almost surely, 2^21097368 is an apocalyptic number.

It is an amenable number.

21097368 is an abundant number, since it is smaller than the sum of its proper divisors (37507032).

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

21097368 is a wasteful number, since it uses less digits than its factorization.

21097368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97688 (or 97678 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21097368 is about 4593.1871287811. The cubic root of 21097368 is about 276.3181586220.

The spelling of 21097368 in words is "twenty-one million, ninety-seven thousand, three hundred sixty-eight".