21202919 has 2 divisors, whose sum is σ = 21202920. Its totient is φ = 21202918.

The previous prime is 21202901. The next prime is 21202957. The reversal of 21202919 is 91920212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202919 - 2⁸ = 21202663 is a prime.

It is a super-2 number, since 2×21202919² = 899127548241122, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1341971 and since 21202919 and 1341971 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601459 + 10601460.

It is an arithmetic number, because the mean of its divisors is an integer number (10601460).

Almost surely, 2^21202919 is an apocalyptic number.

21202919 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202919 is an equidigital number, since it uses as much as digits as its factorization.

21202919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21202919 is about 4604.6627455222. The cubic root of 21202919 is about 276.7782026380.

The spelling of 21202919 in words is "twenty-one million, two hundred two thousand, nine hundred nineteen".