2121231 has 16 divisors (see below), whose sum is σ = 3273984. Its totient is φ = 1196544.

The previous prime is 2121199. The next prime is 2121239. The reversal of 2121231 is 1321212.

2121231 = T₇₇₅ + T₇₇₆ + ... + T₇₈₁.

It is not a de Polignac number, because 2121231 - 2⁵ = 2121199 is a prime.

It is a super-2 number, since 2×2121231² = 8999241910722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121239) 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, 1135 + ... + 2351.

It is an arithmetic number, because the mean of its divisors is an integer number (204624).

2^2121231 is an apocalyptic number.

2121231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2121231 is a deficient number, since it is larger than the sum of its proper divisors (1152753).

2121231 is a wasteful number, since it uses less digits than its factorization.

2121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310.

The product of its digits is 24, while the sum is 12.

The square root of 2121231 is about 1456.4446436442. Note that the first 3 decimals coincide. The cubic root of 2121231 is about 128.4880254503.

Adding to 2121231 its reverse (1321212), we get a palindrome (3442443).

The spelling of 2121231 in words is "two million, one hundred twenty-one thousand, two hundred thirty-one".