21797038889470 has 64 divisors (see below), whose sum is σ = 44486627028480. Its totient is φ = 7622823593088.

The previous prime is 21797038889449. The next prime is 21797038889497. The reversal of 21797038889470 is 7498883079712.

It is a super-2 number, since 2×21797038889470² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21797038889393 and 21797038889402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9927217 + ... + 11922403.

It is an arithmetic number, because the mean of its divisors is an integer number (695103547320).

Almost surely, 2^{21797038889470} is an apocalyptic number.

21797038889470 is an abundant number, since it is smaller than the sum of its proper divisors (22689588139010).

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

21797038889470 is a wasteful number, since it uses less digits than its factorization.

21797038889470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999649.

The product of its (nonzero) digits is 341397504, while the sum is 73.

The spelling of 21797038889470 in words is "twenty-one trillion, seven hundred ninety-seven billion, thirty-eight million, eight hundred eighty-nine thousand, four hundred seventy".