1242212331 has 4 divisors (see below), whose sum is σ = 1656283112. Its totient is φ = 828141552.

The previous prime is 1242212329. The next prime is 1242212339. The reversal of 1242212331 is 1332122421.

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

It is not a de Polignac number, because 1242212331 - 2¹ = 1242212329 is a prime.

It is a super-2 number, since 2×1242212331² = 3086182950576907122, 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 = 1242212298 and 1242212307.

It is not an unprimeable number, because it can be changed into a prime (1242212339) 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, 207035386 + ... + 207035391.

It is an arithmetic number, because the mean of its divisors is an integer number (414070778).

Almost surely, 2^1242212331 is an apocalyptic number.

1242212331 is a deficient number, since it is larger than the sum of its proper divisors (414070781).

1242212331 is an equidigital number, since it uses as much as digits as its factorization.

1242212331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414070780.

The product of its digits is 576, while the sum is 21.

The square root of 1242212331 is about 35245.0327138449. The cubic root of 1242212331 is about 1074.9756132200.

Adding to 1242212331 its reverse (1332122421), we get a palindrome (2574334752).

It can be divided in two parts, 12422 and 12331, that added together give a triangular number (24753 = T₂₂₂).

The spelling of 1242212331 in words is "one billion, two hundred forty-two million, two hundred twelve thousand, three hundred thirty-one".