21621407228059 has 2 divisors, whose sum is σ = 21621407228060. Its totient is φ = 21621407228058.

The previous prime is 21621407228041. The next prime is 21621407228077. The reversal of 21621407228059 is 95082270412612.

It is a balanced prime because it is at equal distance from previous prime (21621407228041) and next prime (21621407228077).

It is a cyclic number.

It is not a de Polignac number, because 21621407228059 - 2¹⁵ = 21621407195291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21621407220059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810703614029 + 10810703614030.

It is an arithmetic number, because the mean of its divisors is an integer number (10810703614030).

Almost surely, 2^{21621407228059} is an apocalyptic number.

21621407228059 is a deficient number, since it is larger than the sum of its proper divisors (1).

21621407228059 is an equidigital number, since it uses as much as digits as its factorization.

21621407228059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 21621407228059 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred seven million, two hundred twenty-eight thousand, fifty-nine".