21303332121 has 16 divisors (see below), whose sum is σ = 29346839424. Its totient is φ = 13735620864.

The previous prime is 21303332117. The next prime is 21303332131. The reversal of 21303332121 is 12123330312.

It is not a de Polignac number, because 21303332121 - 2² = 21303332117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21303332131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556080 + ... + 593153.

It is an arithmetic number, because the mean of its divisors is an integer number (1834177464).

Almost surely, 2^21303332121 is an apocalyptic number.

It is an amenable number.

21303332121 is a deficient number, since it is larger than the sum of its proper divisors (8043507303).

21303332121 is a wasteful number, since it uses less digits than its factorization.

21303332121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149440.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21303332121 its reverse (12123330312), we get a palindrome (33426662433).

The spelling of 21303332121 in words is "twenty-one billion, three hundred three million, three hundred thirty-two thousand, one hundred twenty-one".