31402420421 has 16 divisors (see below), whose sum is σ = 33875554944. Its totient is φ = 29036012544.

The previous prime is 31402420409. The next prime is 31402420429. The reversal of 31402420421 is 12402420413.

It is a de Polignac number, because none of the positive numbers 2^k-31402420421 is a prime.

It is a super-2 number, since 2×31402420421² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402420429) 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, 67736 + ... + 259601.

It is an arithmetic number, because the mean of its divisors is an integer number (2117222184).

Almost surely, 2^31402420421 is an apocalyptic number.

It is an amenable number.

31402420421 is a deficient number, since it is larger than the sum of its proper divisors (2473134523).

31402420421 is a wasteful number, since it uses less digits than its factorization.

31402420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327500.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 31402420421 its reverse (12402420413), we get a palindrome (43804840834).

The spelling of 31402420421 in words is "thirty-one billion, four hundred two million, four hundred twenty thousand, four hundred twenty-one".