21014631 has 24 divisors (see below), whose sum is σ = 34014864. Its totient is φ = 12389760.

The previous prime is 21014629. The next prime is 21014639. The reversal of 21014631 is 13641012.

It is a happy number.

21014631 is a `hidden beast` number, since 21 + 0 + 14 + 631 = 666.

It is not a de Polignac number, because 21014631 - 2¹ = 21014629 is a prime.

It is a super-2 number, since 2×21014631² = 883229432132322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21014639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 795 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (1417286).

Almost surely, 2^21014631 is an apocalyptic number.

21014631 is a deficient number, since it is larger than the sum of its proper divisors (13000233).

21014631 is a wasteful number, since it uses less digits than its factorization.

21014631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5791 (or 5788 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21014631 is about 4584.1717899747. The cubic root of 21014631 is about 275.9564754933.

Adding to 21014631 its reverse (13641012), we get a palindrome (34655643).

It can be divided in two parts, 210 and 14631, that added together give a palindrome (14841).

The spelling of 21014631 in words is "twenty-one million, fourteen thousand, six hundred thirty-one".