21470071664040 has 128 divisors (see below), whose sum is σ = 66666108326400. Its totient is φ = 5525035120640.

The previous prime is 21470071664039. The next prime is 21470071664053. The reversal of 21470071664040 is 4046617007412.

It is a junction number, because it is equal to n+sod(n) for n = 21470071663983 and 21470071664001.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5044705 + ... + 8269775.

It is an arithmetic number, because the mean of its divisors is an integer number (520828971300).

Almost surely, 2^{21470071664040} is an apocalyptic number.

21470071664040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21470071664040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33333054163200).

21470071664040 is an abundant number, since it is smaller than the sum of its proper divisors (45196036662360).

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

21470071664040 is a wasteful number, since it uses less digits than its factorization.

21470071664040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227027 (or 3227023 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The spelling of 21470071664040 in words is "twenty-one trillion, four hundred seventy billion, seventy-one million, six hundred sixty-four thousand, forty".