2031212021 has 4 divisors (see below), whose sum is σ = 2035599552. Its totient is φ = 2026824492.

The previous prime is 2031212017. The next prime is 2031212063. The reversal of 2031212021 is 1202121302.

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 2031212021 - 2² = 2031212017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2031211987 and 2031212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031214021) 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, 2193071 + ... + 2193996.

It is an arithmetic number, because the mean of its divisors is an integer number (508899888).

Almost surely, 2^2031212021 is an apocalyptic number.

It is an amenable number.

2031212021 is a deficient number, since it is larger than the sum of its proper divisors (4387531).

2031212021 is an equidigital number, since it uses as much as digits as its factorization.

2031212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4387530.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2031212021 is about 45068.9696021553. The cubic root of 2031212021 is about 1266.4413616427.

Adding to 2031212021 its reverse (1202121302), we get a palindrome (3233333323).

The spelling of 2031212021 in words is "two billion, thirty-one million, two hundred twelve thousand, twenty-one".