21473919374278 has 32 divisors (see below), whose sum is σ = 36927860465664. Its totient is φ = 9174264913152.

The previous prime is 21473919374191. The next prime is 21473919374291. The reversal of 21473919374278 is 87247391937412.

It is a super-2 number, since 2×21473919374278² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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, 18714550 + ... + 19828822.

It is an arithmetic number, because the mean of its divisors is an integer number (1153995639552).

Almost surely, 2^{21473919374278} is an apocalyptic number.

21473919374278 is a deficient number, since it is larger than the sum of its proper divisors (15453941091386).

21473919374278 is a wasteful number, since it uses less digits than its factorization.

21473919374278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118596.

The product of its digits is 128024064, while the sum is 67.

The spelling of 21473919374278 in words is "twenty-one trillion, four hundred seventy-three billion, nine hundred nineteen million, three hundred seventy-four thousand, two hundred seventy-eight".