21342404016 has 80 divisors (see below), whose sum is σ = 61802874720. Its totient is φ = 7051161600.

The previous prime is 21342404009. The next prime is 21342404033. The reversal of 21342404016 is 61040424312.

It is a happy number.

21342404016 is a `hidden beast` number, since 2 + 13 + 4 + 240 + 401 + 6 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169785 + ... + 267416.

It is an arithmetic number, because the mean of its divisors is an integer number (772535934).

Almost surely, 2^21342404016 is an apocalyptic number.

It is an amenable number.

21342404016 is an abundant number, since it is smaller than the sum of its proper divisors (40460470704).

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

21342404016 is a wasteful number, since it uses less digits than its factorization.

21342404016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437331 (or 437319 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21342404016 its reverse (61040424312), we get a palindrome (82382828328).

The spelling of 21342404016 in words is "twenty-one billion, three hundred forty-two million, four hundred four thousand, sixteen".