21662329603 has 2 divisors, whose sum is σ = 21662329604. Its totient is φ = 21662329602.

The previous prime is 21662329583. The next prime is 21662329613. The reversal of 21662329603 is 30692326612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21662329603 - 2²⁵ = 21628775171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21662329613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10831164801 + 10831164802.

It is an arithmetic number, because the mean of its divisors is an integer number (10831164802).

Almost surely, 2^21662329603 is an apocalyptic number.

21662329603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21662329603 is an equidigital number, since it uses as much as digits as its factorization.

21662329603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 40.

The spelling of 21662329603 in words is "twenty-one billion, six hundred sixty-two million, three hundred twenty-nine thousand, six hundred three".