21121021010311 has 2 divisors, whose sum is σ = 21121021010312. Its totient is φ = 21121021010310.

The previous prime is 21121021010281. The next prime is 21121021010339. The reversal of 21121021010311 is 11301012012112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121021010311 - 2³³ = 21112431075719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121021070311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560510505155 + 10560510505156.

It is an arithmetic number, because the mean of its divisors is an integer number (10560510505156).

Almost surely, 2^{21121021010311} is an apocalyptic number.

21121021010311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121021010311 is an equidigital number, since it uses as much as digits as its factorization.

21121021010311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21121021010311 its reverse (11301012012112), we get a palindrome (32422033022423).

The spelling of 21121021010311 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, ten thousand, three hundred eleven".