31426242021 has 12 divisors (see below), whose sum is σ = 45405747660. Its totient is φ = 20945157120.

The previous prime is 31426242013. The next prime is 31426242037. The reversal of 31426242021 is 12024262413.

31426242021 is a `hidden beast` number, since 3 + 14 + 2 + 624 + 2 + 0 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15008945121 + 16417296900 = 122511^2 + 128130^2 .

It is not a de Polignac number, because 31426242021 - 2³ = 31426242013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31426244021) 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, 437340 + ... + 504101.

It is an arithmetic number, because the mean of its divisors is an integer number (3783812305).

Almost surely, 2^31426242021 is an apocalyptic number.

It is an amenable number.

31426242021 is a deficient number, since it is larger than the sum of its proper divisors (13979505639).

31426242021 is a wasteful number, since it uses less digits than its factorization.

31426242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945156 (or 945153 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The spelling of 31426242021 in words is "thirty-one billion, four hundred twenty-six million, two hundred forty-two thousand, twenty-one".