21203276723 has 2 divisors, whose sum is σ = 21203276724. Its totient is φ = 21203276722.

The previous prime is 21203276711. The next prime is 21203276729. The reversal of 21203276723 is 32767230212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203276723 - 2²² = 21199082419 is a prime.

It is a super-2 number, since 2×21203276723² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21203276729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601638361 + 10601638362.

It is an arithmetic number, because the mean of its divisors is an integer number (10601638362).

Almost surely, 2^21203276723 is an apocalyptic number.

21203276723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203276723 is an equidigital number, since it uses as much as digits as its factorization.

21203276723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 35.

The spelling of 21203276723 in words is "twenty-one billion, two hundred three million, two hundred seventy-six thousand, seven hundred twenty-three".