21436266556 has 12 divisors (see below), whose sum is σ = 37518565392. Its totient is φ = 10716676448.

The previous prime is 21436266499. The next prime is 21436266617. The reversal of 21436266556 is 65566263412.

It is a super-2 number, since 2×21436266556² (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 3 ways as a sum of consecutive naturals, for example, 330760 + ... + 390223.

It is an arithmetic number, because the mean of its divisors is an integer number (3126547116).

Almost surely, 2^21436266556 is an apocalyptic number.

It is an amenable number.

21436266556 is a deficient number, since it is larger than the sum of its proper divisors (16082298836).

21436266556 is a wasteful number, since it uses less digits than its factorization.

21436266556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728420 (or 728418 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 46.

The spelling of 21436266556 in words is "twenty-one billion, four hundred thirty-six million, two hundred sixty-six thousand, five hundred fifty-six".