1242421731 has 12 divisors (see below), whose sum is σ = 1801436208. Its totient is φ = 825130224.

The previous prime is 1242421721. The next prime is 1242421759. The reversal of 1242421731 is 1371242421.

1242421731 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1242421731 - 2⁵ = 1242421699 is a prime.

It is a super-2 number, since 2×1242421731² = 3087223515322072722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1242421695 and 1242421704.

It is not an unprimeable number, because it can be changed into a prime (1242421711) 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, 260080 + ... + 264813.

It is an arithmetic number, because the mean of its divisors is an integer number (150119684).

Almost surely, 2^1242421731 is an apocalyptic number.

1242421731 is a deficient number, since it is larger than the sum of its proper divisors (559014477).

1242421731 is a wasteful number, since it uses less digits than its factorization.

1242421731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525162 (or 525159 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1242421731 is about 35248.0032200407. The cubic root of 1242421731 is about 1075.0360127831.

The spelling of 1242421731 in words is "one billion, two hundred forty-two million, four hundred twenty-one thousand, seven hundred thirty-one".