2131222021 has 8 divisors (see below), whose sum is σ = 2225194560. Its totient is φ = 2037358752.

The previous prime is 2131222019. The next prime is 2131222031. The reversal of 2131222021 is 1202221312.

It is a happy number.

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 2131222021 - 2¹ = 2131222019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131221986 and 2131222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131222031) 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, 13890 + ... + 66748.

It is an arithmetic number, because the mean of its divisors is an integer number (278149320).

Almost surely, 2^2131222021 is an apocalyptic number.

It is an amenable number.

2131222021 is a deficient number, since it is larger than the sum of its proper divisors (93972539).

2131222021 is a wasteful number, since it uses less digits than its factorization.

2131222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54635.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2131222021 is about 46165.1602509945. The cubic root of 2131222021 is about 1286.8943622898.

Adding to 2131222021 its reverse (1202221312), we get a palindrome (3333443333).

The spelling of 2131222021 in words is "two billion, one hundred thirty-one million, two hundred twenty-two thousand, twenty-one".