10687731421 has 4 divisors (see below), whose sum is σ = 10689304672. Its totient is φ = 10686158172.

The previous prime is 10687731413. The next prime is 10687731437. The reversal of 10687731421 is 12413778601.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 10687731421 - 2³ = 10687731413 is a prime.

It is a super-2 number, since 2×10687731421² (a number of 21 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 (10687731121) 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, 776391 + ... + 790036.

It is an arithmetic number, because the mean of its divisors is an integer number (2672326168).

Almost surely, 2^10687731421 is an apocalyptic number.

It is an amenable number.

10687731421 is a deficient number, since it is larger than the sum of its proper divisors (1573251).

10687731421 is an equidigital number, since it uses as much as digits as its factorization.

10687731421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573250.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 10687731421 in words is "ten billion, six hundred eighty-seven million, seven hundred thirty-one thousand, four hundred twenty-one".