21406126 has 8 divisors (see below), whose sum is σ = 36696240. Its totient is φ = 9174048.

The previous prime is 21406109. The next prime is 21406153. The reversal of 21406126 is 62160412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21406097 and 21406106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764491 + ... + 764518.

It is an arithmetic number, because the mean of its divisors is an integer number (4587030).

Almost surely, 2^21406126 is an apocalyptic number.

21406126 is a deficient number, since it is larger than the sum of its proper divisors (15290114).

21406126 is a wasteful number, since it uses less digits than its factorization.

21406126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529018.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21406126 is about 4626.6754802990. The cubic root of 21406126 is about 277.6595992341.

Adding to 21406126 its reverse (62160412), we get a palindrome (83566538).

The spelling of 21406126 in words is "twenty-one million, four hundred six thousand, one hundred twenty-six".