31011003421 has 4 divisors (see below), whose sum is σ = 31011383772. Its totient is φ = 31010623072.

The previous prime is 31011003403. The next prime is 31011003433. The reversal of 31011003421 is 12430011013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 510127396 + 30500876025 = 22586^2 + 174645^2 .

It is a cyclic number.

It is not a de Polignac number, because 31011003421 - 2²³ = 31002614813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31011003395 and 31011003404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011000421) 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, 12616 + ... + 249361.

It is an arithmetic number, because the mean of its divisors is an integer number (7752845943).

Almost surely, 2^31011003421 is an apocalyptic number.

It is an amenable number.

31011003421 is a deficient number, since it is larger than the sum of its proper divisors (380351).

31011003421 is a wasteful number, since it uses less digits than its factorization.

31011003421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380350.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31011003421 its reverse (12430011013), we get a palindrome (43441014434).

The spelling of 31011003421 in words is "thirty-one billion, eleven million, three thousand, four hundred twenty-one".