21021320114421 has 24 divisors (see below), whose sum is σ = 31113136313952. Its totient is φ = 12614053452000.

The previous prime is 21021320114383. The next prime is 21021320114521. The reversal of 21021320114421 is 12441102312012.

It is not a de Polignac number, because 21021320114421 - 2²¹ = 21021318017269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021320114391 and 21021320114400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021320114521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 286646371 + ... + 286719696.

It is an arithmetic number, because the mean of its divisors is an integer number (1296380679748).

Almost surely, 2^{21021320114421} is an apocalyptic number.

It is an amenable number.

21021320114421 is a deficient number, since it is larger than the sum of its proper divisors (10091816199531).

21021320114421 is a wasteful number, since it uses less digits than its factorization.

21021320114421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573366193 (or 573366182 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 21021320114421 its reverse (12441102312012), we get a palindrome (33462422426433).

The spelling of 21021320114421 in words is "twenty-one trillion, twenty-one billion, three hundred twenty million, one hundred fourteen thousand, four hundred twenty-one".