31402242021 has 4 divisors (see below), whose sum is σ = 41869656032. Its totient is φ = 20934828012.

The previous prime is 31402242007. The next prime is 31402242037. The reversal of 31402242021 is 12024220413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31402242021 - 2¹⁵ = 31402209253 is a prime.

It is a super-2 number, since 2×31402242021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402242041) 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, 5233707001 + ... + 5233707006.

It is an arithmetic number, because the mean of its divisors is an integer number (10467414008).

Almost surely, 2^31402242021 is an apocalyptic number.

It is an amenable number.

31402242021 is a deficient number, since it is larger than the sum of its proper divisors (10467414011).

31402242021 is a wasteful number, since it uses less digits than its factorization.

31402242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10467414010.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 31402242021 its reverse (12024220413), we get a palindrome (43426462434).

The spelling of 31402242021 in words is "thirty-one billion, four hundred two million, two hundred forty-two thousand, twenty-one".