2311220231021 has 8 divisors (see below), whose sum is σ = 2489191276824. Its totient is φ = 2133275595840.

The previous prime is 2311220231017. The next prime is 2311220231071. The reversal of 2311220231021 is 1201320221132.

It can be written as a sum of positive squares in 4 ways, for example, as 100987941796 + 2210232289225 = 317786^2 + 1486685^2 .

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 2311220231021 - 2² = 2311220231017 is a prime.

It is a super-2 number, since 2×2311220231021² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2311220230984 and 2311220231002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311220231071) 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, 6420710 + ... + 6771111.

It is an arithmetic number, because the mean of its divisors is an integer number (311148909603).

Almost surely, 2^{2311220231021} is an apocalyptic number.

It is an amenable number.

2311220231021 is a deficient number, since it is larger than the sum of its proper divisors (177971045803).

2311220231021 is a wasteful number, since it uses less digits than its factorization.

2311220231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13205311.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 2311220231021 its reverse (1201320221132), we get a palindrome (3512540452153).

The spelling of 2311220231021 in words is "two trillion, three hundred eleven billion, two hundred twenty million, two hundred thirty-one thousand, twenty-one".