21121002331 has 8 divisors (see below), whose sum is σ = 24813485424. Its totient is φ = 17723917920.

The previous prime is 21121002293. The next prime is 21121002361. The reversal of 21121002331 is 13320012112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121002331 - 2²¹ = 21118905179 is a prime.

It is a super-2 number, since 2×21121002331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121002361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73849516 + ... + 73849801.

It is an arithmetic number, because the mean of its divisors is an integer number (3101685678).

Almost surely, 2^21121002331 is an apocalyptic number.

21121002331 is a deficient number, since it is larger than the sum of its proper divisors (3692483093).

21121002331 is a wasteful number, since it uses less digits than its factorization.

21121002331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147699341.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21121002331 its reverse (13320012112), we get a palindrome (34441014443).

The spelling of 21121002331 in words is "twenty-one billion, one hundred twenty-one million, two thousand, three hundred thirty-one".