21471217422 has 16 divisors (see below), whose sum is σ = 42983306112. Its totient is φ = 7150260600.

The previous prime is 21471217421. The next prime is 21471217457. The reversal of 21471217422 is 22471217412.

It is a super-2 number, since 2×21471217422² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471217421) 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, 1696138 + ... + 1708749.

It is an arithmetic number, because the mean of its divisors is an integer number (2686456632).

Almost surely, 2^21471217422 is an apocalyptic number.

21471217422 is an abundant number, since it is smaller than the sum of its proper divisors (21512088690).

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

21471217422 is a wasteful number, since it uses less digits than its factorization.

21471217422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3405943.

The product of its digits is 12544, while the sum is 33.

The spelling of 21471217422 in words is "twenty-one billion, four hundred seventy-one million, two hundred seventeen thousand, four hundred twenty-two".