31420040421 has 32 divisors (see below), whose sum is σ = 53915590656. Its totient is φ = 15795576000.

The previous prime is 31420040419. The next prime is 31420040423. The reversal of 31420040421 is 12404002413.

It is an interprime number because it is at equal distance from previous prime (31420040419) and next prime (31420040423).

It is not a de Polignac number, because 31420040421 - 2¹ = 31420040419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420040423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2186670 + ... + 2200991.

It is an arithmetic number, because the mean of its divisors is an integer number (1684862208).

Almost surely, 2^31420040421 is an apocalyptic number.

31420040421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31420040421 is a deficient number, since it is larger than the sum of its proper divisors (22495550235).

31420040421 is a wasteful number, since it uses less digits than its factorization.

31420040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4387713.

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

Adding to 31420040421 its reverse (12404002413), we get a palindrome (43824042834).

The spelling of 31420040421 in words is "thirty-one billion, four hundred twenty million, forty thousand, four hundred twenty-one".