21354361051 has 2 divisors, whose sum is σ = 21354361052. Its totient is φ = 21354361050.

The previous prime is 21354361031. The next prime is 21354361103. The reversal of 21354361051 is 15016345312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21354361051 - 2³³ = 12764426459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21354361001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677180525 + 10677180526.

It is an arithmetic number, because the mean of its divisors is an integer number (10677180526).

Almost surely, 2^21354361051 is an apocalyptic number.

21354361051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21354361051 is an equidigital number, since it uses as much as digits as its factorization.

21354361051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 21354361051 in words is "twenty-one billion, three hundred fifty-four million, three hundred sixty-one thousand, fifty-one".