20310111121 has 4 divisors (see below), whose sum is σ = 20311170544. Its totient is φ = 20309051700.

The previous prime is 20310111103. The next prime is 20310111137. The reversal of 20310111121 is 12111101302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20310111121 - 2⁷ = 20310110993 is a prime.

It is a super-2 number, since 2×20310111121² (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 (20310111421) 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, 500415 + ... + 539476.

It is an arithmetic number, because the mean of its divisors is an integer number (5077792636).

Almost surely, 2^20310111121 is an apocalyptic number.

It is an amenable number.

20310111121 is a deficient number, since it is larger than the sum of its proper divisors (1059423).

20310111121 is a wasteful number, since it uses less digits than its factorization.

20310111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059422.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20310111121 its reverse (12111101302), we get a palindrome (32421212423).

The spelling of 20310111121 in words is "twenty billion, three hundred ten million, one hundred eleven thousand, one hundred twenty-one".