21471226556 has 24 divisors (see below), whose sum is σ = 41068965840. Its totient is φ = 9761887872.

The previous prime is 21471226537. The next prime is 21471226597. The reversal of 21471226556 is 65562217412.

It is a super-2 number, since 2×21471226556² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3077921 + ... + 3084888.

It is an arithmetic number, because the mean of its divisors is an integer number (1711206910).

Almost surely, 2^21471226556 is an apocalyptic number.

21471226556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21471226556 is a deficient number, since it is larger than the sum of its proper divisors (19597739284).

21471226556 is a wasteful number, since it uses less digits than its factorization.

21471226556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6162893 (or 6162891 counting only the distinct ones).

The product of its digits is 201600, while the sum is 41.

The spelling of 21471226556 in words is "twenty-one billion, four hundred seventy-one million, two hundred twenty-six thousand, five hundred fifty-six".