21975484401 has 48 divisors (see below), whose sum is σ = 36246699216. Its totient is φ = 12709675008.

The previous prime is 21975484387. The next prime is 21975484403. The reversal of 21975484401 is 10448457912.

21975484401 is a `hidden beast` number, since 2 + 197 + 54 + 8 + 4 + 401 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1476403776 + 20499080625 = 38424^2 + 143175^2 .

It is not a de Polignac number, because 21975484401 - 2⁶ = 21975484337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21975484403) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1450401 + ... + 1465473.

It is an arithmetic number, because the mean of its divisors is an integer number (755139567).

Almost surely, 2^21975484401 is an apocalyptic number.

It is an amenable number.

21975484401 is a deficient number, since it is larger than the sum of its proper divisors (14271214815).

21975484401 is a wasteful number, since it uses less digits than its factorization.

21975484401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15842 (or 15839 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 21975484401 in words is "twenty-one billion, nine hundred seventy-five million, four hundred eighty-four thousand, four hundred one".