21461214889 has 2 divisors, whose sum is σ = 21461214890. Its totient is φ = 21461214888.

The previous prime is 21461214857. The next prime is 21461214893. The reversal of 21461214889 is 98841216412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20144976489 + 1316238400 = 141933^2 + 36280^2 .

It is a cyclic number.

It is not a de Polignac number, because 21461214889 - 2⁵ = 21461214857 is a prime.

It is not a weakly prime, because it can be changed into another prime (21461214829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730607444 + 10730607445.

It is an arithmetic number, because the mean of its divisors is an integer number (10730607445).

Almost surely, 2^21461214889 is an apocalyptic number.

It is an amenable number.

21461214889 is a deficient number, since it is larger than the sum of its proper divisors (1).

21461214889 is an equidigital number, since it uses as much as digits as its factorization.

21461214889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 46.

The spelling of 21461214889 in words is "twenty-one billion, four hundred sixty-one million, two hundred fourteen thousand, eight hundred eighty-nine".