2121151231 has 8 divisors (see below), whose sum is σ = 2162053584. Its totient is φ = 2080446720.

The previous prime is 2121151211. The next prime is 2121151267. The reversal of 2121151231 is 1321511212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121151231 is a prime.

It is a super-2 number, since 2×2121151231² = 8998565089545630722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121151199 and 2121151208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121151211) 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, 27721 + ... + 70786.

It is an arithmetic number, because the mean of its divisors is an integer number (270256698).

Almost surely, 2^2121151231 is an apocalyptic number.

2121151231 is a deficient number, since it is larger than the sum of its proper divisors (40902353).

2121151231 is an equidigital number, since it uses as much as digits as its factorization.

2121151231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98921.

The product of its digits is 120, while the sum is 19.

The square root of 2121151231 is about 46055.9576059385. The cubic root of 2121151231 is about 1284.8641483052.

Adding to 2121151231 its reverse (1321511212), we get a palindrome (3442662443).

The spelling of 2121151231 in words is "two billion, one hundred twenty-one million, one hundred fifty-one thousand, two hundred thirty-one".