21020313331311 has 32 divisors (see below), whose sum is σ = 32785157357568. Its totient is φ = 11728939713120.

The previous prime is 21020313331289. The next prime is 21020313331349. The reversal of 21020313331311 is 11313331302012.

It is not a de Polignac number, because 21020313331311 - 2⁷ = 21020313331183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020313331411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115135 + ... + 6484896.

It is an arithmetic number, because the mean of its divisors is an integer number (1024536167424).

Almost surely, 2^{21020313331311} is an apocalyptic number.

21020313331311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21020313331311 is a deficient number, since it is larger than the sum of its proper divisors (11764844026257).

21020313331311 is a wasteful number, since it uses less digits than its factorization.

21020313331311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6603611.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 21020313331311 its reverse (11313331302012), we get a palindrome (32333644633323).

The spelling of 21020313331311 in words is "twenty-one trillion, twenty billion, three hundred thirteen million, three hundred thirty-one thousand, three hundred eleven".