21731654603 has 2 divisors, whose sum is σ = 21731654604. Its totient is φ = 21731654602.

The previous prime is 21731654561. The next prime is 21731654639. The reversal of 21731654603 is 30645613712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21731654603 - 2¹⁶ = 21731589067 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21731659603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10865827301 + 10865827302.

It is an arithmetic number, because the mean of its divisors is an integer number (10865827302).

Almost surely, 2^21731654603 is an apocalyptic number.

21731654603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21731654603 is an equidigital number, since it uses as much as digits as its factorization.

21731654603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 21731654603 in words is "twenty-one billion, seven hundred thirty-one million, six hundred fifty-four thousand, six hundred three".