21621411422407 has 2 divisors, whose sum is σ = 21621411422408. Its totient is φ = 21621411422406.

The previous prime is 21621411422363. The next prime is 21621411422411. The reversal of 21621411422407 is 70422411412612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21621411422407 - 2¹¹ = 21621411420359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21621411423407) 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, 10810705711203 + 10810705711204.

It is an arithmetic number, because the mean of its divisors is an integer number (10810705711204).

Almost surely, 2^{21621411422407} is an apocalyptic number.

21621411422407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21621411422407 is an equidigital number, since it uses as much as digits as its factorization.

21621411422407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 37.

The spelling of 21621411422407 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred eleven million, four hundred twenty-two thousand, four hundred seven".