21475228694197 has 8 divisors (see below), whose sum is σ = 22232588846976. Its totient is φ = 20730386891232.

The previous prime is 21475228694159. The next prime is 21475228694209. The reversal of 21475228694197 is 79149682257412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21475228694197 is a prime.

It is a super-2 number, since 2×21475228694197² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475228694897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3129583963 + ... + 3129590824.

It is an arithmetic number, because the mean of its divisors is an integer number (2779073605872).

Almost surely, 2^{21475228694197} is an apocalyptic number.

It is an amenable number.

21475228694197 is a deficient number, since it is larger than the sum of its proper divisors (757360152779).

21475228694197 is an equidigital number, since it uses as much as digits as its factorization.

21475228694197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6259174907.

The product of its digits is 121927680, while the sum is 67.

The spelling of 21475228694197 in words is "twenty-one trillion, four hundred seventy-five billion, two hundred twenty-eight million, six hundred ninety-four thousand, one hundred ninety-seven".