21873487254049 has 2 divisors, whose sum is σ = 21873487254050. Its totient is φ = 21873487254048.

The previous prime is 21873487254041. The next prime is 21873487254107. The reversal of 21873487254049 is 94045278437812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21870821390625 + 2665863424 = 4676625^2 + 51632^2 .

It is a cyclic number.

It is not a de Polignac number, because 21873487254049 - 2³ = 21873487254041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21873487254041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10936743627024 + 10936743627025.

It is an arithmetic number, because the mean of its divisors is an integer number (10936743627025).

Almost surely, 2^{21873487254049} is an apocalyptic number.

It is an amenable number.

21873487254049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21873487254049 is an equidigital number, since it uses as much as digits as its factorization.

21873487254049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108380160, while the sum is 64.

The spelling of 21873487254049 in words is "twenty-one trillion, eight hundred seventy-three billion, four hundred eighty-seven million, two hundred fifty-four thousand, forty-nine".