21610263403 has 2 divisors, whose sum is σ = 21610263404. Its totient is φ = 21610263402.

The previous prime is 21610263379. The next prime is 21610263421. The reversal of 21610263403 is 30436201612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21610263403 is a prime.

It is a super-2 number, since 2×21610263403² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21610263503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805131701 + 10805131702.

It is an arithmetic number, because the mean of its divisors is an integer number (10805131702).

Almost surely, 2^21610263403 is an apocalyptic number.

21610263403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21610263403 is an equidigital number, since it uses as much as digits as its factorization.

21610263403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 21610263403 in words is "twenty-one billion, six hundred ten million, two hundred sixty-three thousand, four hundred three".