21120210331 has 4 divisors (see below), whose sum is σ = 23040229464. Its totient is φ = 19200191200.

The previous prime is 21120210311. The next prime is 21120210337. The reversal of 21120210331 is 13301202112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21120210331 - 2⁹ = 21120209819 is a prime.

It is a super-2 number, since 2×21120210331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120210337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960009550 + ... + 960009571.

It is an arithmetic number, because the mean of its divisors is an integer number (5760057366).

Almost surely, 2^21120210331 is an apocalyptic number.

21120210331 is a deficient number, since it is larger than the sum of its proper divisors (1920019133).

21120210331 is a wasteful number, since it uses less digits than its factorization.

21120210331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920019132.

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

Adding to 21120210331 its reverse (13301202112), we get a palindrome (34421412443).

The spelling of 21120210331 in words is "twenty-one billion, one hundred twenty million, two hundred ten thousand, three hundred thirty-one".