14521636421 has 2 divisors, whose sum is σ = 14521636422. Its totient is φ = 14521636420.

The previous prime is 14521636417. The next prime is 14521636427. The reversal of 14521636421 is 12463612541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13568988196 + 952648225 = 116486^2 + 30865^2 .

It is a cyclic number.

It is not a de Polignac number, because 14521636421 - 2² = 14521636417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14521636427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7260818210 + 7260818211.

It is an arithmetic number, because the mean of its divisors is an integer number (7260818211).

Almost surely, 2^14521636421 is an apocalyptic number.

It is an amenable number.

14521636421 is a deficient number, since it is larger than the sum of its proper divisors (1).

14521636421 is an equidigital number, since it uses as much as digits as its factorization.

14521636421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The spelling of 14521636421 in words is "fourteen billion, five hundred twenty-one million, six hundred thirty-six thousand, four hundred twenty-one".