21072199 has 2 divisors, whose sum is σ = 21072200. Its totient is φ = 21072198.

The previous prime is 21072187. The next prime is 21072211. The reversal of 21072199 is 99127012.

It is a balanced prime because it is at equal distance from previous prime (21072187) and next prime (21072211).

It is a cyclic number.

It is not a de Polignac number, because 21072199 - 2²³ = 12683591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21072199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21072169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536099 + 10536100.

It is an arithmetic number, because the mean of its divisors is an integer number (10536100).

Almost surely, 2^21072199 is an apocalyptic number.

21072199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21072199 is an equidigital number, since it uses as much as digits as its factorization.

21072199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 21072199 is about 4590.4464924449. The cubic root of 21072199 is about 276.2082330745.

The spelling of 21072199 in words is "twenty-one million, seventy-two thousand, one hundred ninety-nine".