21201329923 has 2 divisors, whose sum is σ = 21201329924. Its totient is φ = 21201329922.

The previous prime is 21201329917. The next prime is 21201330047. The reversal of 21201329923 is 32992310212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21201329923 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201329423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600664961 + 10600664962.

It is an arithmetic number, because the mean of its divisors is an integer number (10600664962).

Almost surely, 2^21201329923 is an apocalyptic number.

21201329923 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201329923 is an equidigital number, since it uses as much as digits as its factorization.

21201329923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 21201329923 in words is "twenty-one billion, two hundred one million, three hundred twenty-nine thousand, nine hundred twenty-three".