2131010221 has 4 divisors (see below), whose sum is σ = 2176350912. Its totient is φ = 2085669532.

The previous prime is 2131010207. The next prime is 2131010239. The reversal of 2131010221 is 1220101312.

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 2131010221 - 2¹⁹ = 2130485933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131010281) 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, 22670275 + ... + 22670368.

It is an arithmetic number, because the mean of its divisors is an integer number (544087728).

Almost surely, 2^2131010221 is an apocalyptic number.

It is an amenable number.

2131010221 is a deficient number, since it is larger than the sum of its proper divisors (45340691).

2131010221 is an equidigital number, since it uses as much as digits as its factorization.

2131010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45340690.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2131010221 is about 46162.8662563320. The cubic root of 2131010221 is about 1286.8517305270.

Adding to 2131010221 its reverse (1220101312), we get a palindrome (3351111533).

The spelling of 2131010221 in words is "two billion, one hundred thirty-one million, ten thousand, two hundred twenty-one".