21014004331 has 32 divisors (see below), whose sum is σ = 22937201280. Its totient is φ = 19203609600.

The previous prime is 21014004311. The next prime is 21014004343. The reversal of 21014004331 is 13340041012.

It is a cyclic number.

It is not a de Polignac number, because 21014004331 - 2⁷ = 21014004203 is a prime.

It is a super-2 number, since 2×21014004331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21014004299 and 21014004308.

It is not an unprimeable number, because it can be changed into a prime (21014004311) 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, 27759205 + ... + 27759961.

It is an arithmetic number, because the mean of its divisors is an integer number (716787540).

Almost surely, 2^21014004331 is an apocalyptic number.

21014004331 is a deficient number, since it is larger than the sum of its proper divisors (1923196949).

21014004331 is a wasteful number, since it uses less digits than its factorization.

21014004331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21014004331 its reverse (13340041012), we get a palindrome (34354045343).

The spelling of 21014004331 in words is "twenty-one billion, fourteen million, four thousand, three hundred thirty-one".