21041555323 has 2 divisors, whose sum is σ = 21041555324. Its totient is φ = 21041555322.

The previous prime is 21041555239. The next prime is 21041555357. The reversal of 21041555323 is 32355514012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21041555323 - 2⁹ = 21041554811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21041555363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520777661 + 10520777662.

It is an arithmetic number, because the mean of its divisors is an integer number (10520777662).

Almost surely, 2^21041555323 is an apocalyptic number.

21041555323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041555323 is an equidigital number, since it uses as much as digits as its factorization.

21041555323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21041555323 in words is "twenty-one billion, forty-one million, five hundred fifty-five thousand, three hundred twenty-three".