21192801 has 16 divisors (see below), whose sum is σ = 32492544. Its totient is φ = 12035664.

The previous prime is 21192797. The next prime is 21192827. The reversal of 21192801 is 10829112.

It is not a de Polignac number, because 21192801 - 2² = 21192797 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21190801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486 + ... + 6528.

It is an arithmetic number, because the mean of its divisors is an integer number (2030784).

Almost surely, 2^21192801 is an apocalyptic number.

21192801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21192801 is a deficient number, since it is larger than the sum of its proper divisors (11299743).

21192801 is a wasteful number, since it uses less digits than its factorization.

21192801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6220.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 21192801 is about 4603.5639454666. The cubic root of 21192801 is about 276.7341695904.

The spelling of 21192801 in words is "twenty-one million, one hundred ninety-two thousand, eight hundred one".