21479666154 has 8 divisors (see below), whose sum is σ = 42959332320. Its totient is φ = 7159888716.

The previous prime is 21479666149. The next prime is 21479666161. The reversal of 21479666154 is 45166697412.

It is a happy number.

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

21479666154 is an admirable number.

It is a super-2 number, since 2×21479666154² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21479666097 and 21479666106.

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, 1789972174 + ... + 1789972185.

It is an arithmetic number, because the mean of its divisors is an integer number (5369916540).

Almost surely, 2^21479666154 is an apocalyptic number.

21479666154 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21479666154 is a wasteful number, since it uses less digits than its factorization.

21479666154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3579944364.

The product of its digits is 2177280, while the sum is 51.

The spelling of 21479666154 in words is "twenty-one billion, four hundred seventy-nine million, six hundred sixty-six thousand, one hundred fifty-four".