21884629121 has 2 divisors, whose sum is σ = 21884629122. Its totient is φ = 21884629120.

The previous prime is 21884629079. The next prime is 21884629139. The reversal of 21884629121 is 12192648812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13844816896 + 8039812225 = 117664^2 + 89665^2 .

It is a cyclic number.

It is not a de Polignac number, because 21884629121 - 2³⁴ = 4704759937 is a prime.

It is not a weakly prime, because it can be changed into another prime (21884629021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942314560 + 10942314561.

It is an arithmetic number, because the mean of its divisors is an integer number (10942314561).

Almost surely, 2^21884629121 is an apocalyptic number.

It is an amenable number.

21884629121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21884629121 is an equidigital number, since it uses as much as digits as its factorization.

21884629121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 44.

The spelling of 21884629121 in words is "twenty-one billion, eight hundred eighty-four million, six hundred twenty-nine thousand, one hundred twenty-one".