21097476 has 48 divisors (see below), whose sum is σ = 57919680. Its totient is φ = 6618240.

The previous prime is 21097469. The next prime is 21097481. The reversal of 21097476 is 67479012.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21097476.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3910 + ... + 7581.

It is an arithmetic number, because the mean of its divisors is an integer number (1206660).

Almost surely, 2^21097476 is an apocalyptic number.

It is an amenable number.

21097476 is an abundant number, since it is smaller than the sum of its proper divisors (36822204).

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

21097476 is a wasteful number, since it uses less digits than its factorization.

21097476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11521 (or 11513 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 21097476 is about 4593.1988853086. The cubic root of 21097476 is about 276.3186301233.

The spelling of 21097476 in words is "twenty-one million, ninety-seven thousand, four hundred seventy-six".