2131121401 has 4 divisors (see below), whose sum is σ = 2133552292. Its totient is φ = 2128690512.

The previous prime is 2131121393. The next prime is 2131121407. The reversal of 2131121401 is 1041211312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 756195001 + 1374926400 = 27499^2 + 37080^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131121401 - 2³ = 2131121393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131121407) 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, 1214130 + ... + 1215883.

It is an arithmetic number, because the mean of its divisors is an integer number (533388073).

Almost surely, 2^2131121401 is an apocalyptic number.

It is an amenable number.

2131121401 is a deficient number, since it is larger than the sum of its proper divisors (2430891).

2131121401 is an equidigital number, since it uses as much as digits as its factorization.

2131121401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2430890.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 2131121401 is about 46164.0704552794. The cubic root of 2131121401 is about 1286.8741095354.

Adding to 2131121401 its reverse (1041211312), we get a palindrome (3172332713).

The spelling of 2131121401 in words is "two billion, one hundred thirty-one million, one hundred twenty-one thousand, four hundred one".