21621200041279 has 2 divisors, whose sum is σ = 21621200041280. Its totient is φ = 21621200041278.

The previous prime is 21621200041183. The next prime is 21621200041303. The reversal of 21621200041279 is 97214000212612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21621200041279 - 2⁷ = 21621200041151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21621200021279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810600020639 + 10810600020640.

It is an arithmetic number, because the mean of its divisors is an integer number (10810600020640).

Almost surely, 2^{21621200041279} is an apocalyptic number.

21621200041279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21621200041279 is an equidigital number, since it uses as much as digits as its factorization.

21621200041279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 21621200041279 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred million, forty-one thousand, two hundred seventy-nine".