21712630441 has 2 divisors, whose sum is σ = 21712630442. Its totient is φ = 21712630440.

The previous prime is 21712630327. The next prime is 21712630477. The reversal of 21712630441 is 14403621712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17109686416 + 4602944025 = 130804^2 + 67845^2 .

It is a cyclic number.

It is not a de Polignac number, because 21712630441 - 2¹⁹ = 21712106153 is a prime.

It is a super-3 number, since 3×21712630441³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21712630481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10856315220 + 10856315221.

It is an arithmetic number, because the mean of its divisors is an integer number (10856315221).

Almost surely, 2^21712630441 is an apocalyptic number.

It is an amenable number.

21712630441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21712630441 is an equidigital number, since it uses as much as digits as its factorization.

21712630441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The spelling of 21712630441 in words is "twenty-one billion, seven hundred twelve million, six hundred thirty thousand, four hundred forty-one".