2121311401 has 16 divisors (see below), whose sum is σ = 2398530240. Its totient is φ = 1858409280.

The previous prime is 2121311393. The next prime is 2121311441. The reversal of 2121311401 is 1041131212.

It is a cyclic number.

It is not a de Polignac number, because 2121311401 - 2³ = 2121311393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121311441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168415 + ... + 180571.

It is an arithmetic number, because the mean of its divisors is an integer number (149908140).

Almost surely, 2^2121311401 is an apocalyptic number.

It is an amenable number.

2121311401 is a deficient number, since it is larger than the sum of its proper divisors (277218839).

2121311401 is a wasteful number, since it uses less digits than its factorization.

2121311401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12744.

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

The square root of 2121311401 is about 46057.6964361007. The cubic root of 2121311401 is about 1284.8964878995.

Adding to 2121311401 its reverse (1041131212), we get a palindrome (3162442613).

The spelling of 2121311401 in words is "two billion, one hundred twenty-one million, three hundred eleven thousand, four hundred one".