2121331401 has 12 divisors (see below), whose sum is σ = 3501880512. Its totient is φ = 1212189336.

The previous prime is 2121331393. The next prime is 2121331447. The reversal of 2121331401 is 1041331212.

2121331401 is a `hidden beast` number, since 21 + 213 + 31 + 401 = 666.

It is not a de Polignac number, because 2121331401 - 2³ = 2121331393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121331001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16835901 + ... + 16836026.

It is an arithmetic number, because the mean of its divisors is an integer number (291823376).

Almost surely, 2^2121331401 is an apocalyptic number.

2121331401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2121331401 is a deficient number, since it is larger than the sum of its proper divisors (1380549111).

2121331401 is a wasteful number, since it uses less digits than its factorization.

2121331401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33671940 (or 33671937 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2121331401 is about 46057.9135545674. The cubic root of 2121331401 is about 1284.9005259440.

Adding to 2121331401 its reverse (1041331212), we get a palindrome (3162662613).

The spelling of 2121331401 in words is "two billion, one hundred twenty-one million, three hundred thirty-one thousand, four hundred one".