21471464317642 has 64 divisors (see below), whose sum is σ = 35399844979200. Its totient is φ = 9734791207680.

The previous prime is 21471464317579. The next prime is 21471464317649. The reversal of 21471464317642 is 24671346417412.

It is a super-2 number, since 2×21471464317642² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21471464317642.

It is not an unprimeable number, because it can be changed into a prime (21471464317649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45088459 + ... + 45562177.

It is an arithmetic number, because the mean of its divisors is an integer number (553122577800).

Almost surely, 2^{21471464317642} is an apocalyptic number.

21471464317642 is a deficient number, since it is larger than the sum of its proper divisors (13928380661558).

21471464317642 is a wasteful number, since it uses less digits than its factorization.

21471464317642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474391.

The product of its digits is 5419008, while the sum is 52.

The spelling of 21471464317642 in words is "twenty-one trillion, four hundred seventy-one billion, four hundred sixty-four million, three hundred seventeen thousand, six hundred forty-two".