2131213021 has 8 divisors (see below), whose sum is σ = 2446127424. Its totient is φ = 1818912480.

The previous prime is 2131213013. The next prime is 2131213043. The reversal of 2131213021 is 1203121312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2131213021 - 2³ = 2131213013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2131212986 and 2131213004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131213121) 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, 651715 + ... + 654976.

It is an arithmetic number, because the mean of its divisors is an integer number (305765928).

Almost surely, 2^2131213021 is an apocalyptic number.

It is an amenable number.

2131213021 is a deficient number, since it is larger than the sum of its proper divisors (314914403).

2131213021 is a wasteful number, since it uses less digits than its factorization.

2131213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306931.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2131213021 is about 46165.0627747867. The cubic root of 2131213021 is about 1286.8925507993.

Adding to 2131213021 its reverse (1203121312), we get a palindrome (3334334333).

The spelling of 2131213021 in words is "two billion, one hundred thirty-one million, two hundred thirteen thousand, twenty-one".