21478979126 has 16 divisors (see below), whose sum is σ = 35672011200. Its totient is φ = 9617452680.

The previous prime is 21478979117. The next prime is 21478979173. The reversal of 21478979126 is 62197987412.

It is a happy number.

21478979126 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21478979126² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7284476 + ... + 7287423.

It is an arithmetic number, because the mean of its divisors is an integer number (2229500700).

Almost surely, 2^21478979126 is an apocalyptic number.

21478979126 is a deficient number, since it is larger than the sum of its proper divisors (14193032074).

21478979126 is a wasteful number, since it uses less digits than its factorization.

21478979126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14571979.

The product of its digits is 3048192, while the sum is 56.

The spelling of 21478979126 in words is "twenty-one billion, four hundred seventy-eight million, nine hundred seventy-nine thousand, one hundred twenty-six".