21624401299 has 2 divisors, whose sum is σ = 21624401300. Its totient is φ = 21624401298.

The previous prime is 21624401291. The next prime is 21624401341. The reversal of 21624401299 is 99210442612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21624401299 - 2³ = 21624401291 is a prime.

It is a super-2 number, since 2×21624401299² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21624401291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10812200649 + 10812200650.

It is an arithmetic number, because the mean of its divisors is an integer number (10812200650).

Almost surely, 2^21624401299 is an apocalyptic number.

21624401299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21624401299 is an equidigital number, since it uses as much as digits as its factorization.

21624401299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 21624401299 in words is "twenty-one billion, six hundred twenty-four million, four hundred one thousand, two hundred ninety-nine".