21533653626 has 16 divisors (see below), whose sum is σ = 43612464000. Its totient is φ = 7087025088.

The previous prime is 21533653601. The next prime is 21533653627. The reversal of 21533653626 is 62635633512.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21533653627) 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, 22714351 + ... + 22715298.

It is an arithmetic number, because the mean of its divisors is an integer number (2725779000).

Almost surely, 2^21533653626 is an apocalyptic number.

21533653626 is an abundant number, since it is smaller than the sum of its proper divisors (22078810374).

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

21533653626 is a wasteful number, since it uses less digits than its factorization.

21533653626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45429733.

The product of its digits is 583200, while the sum is 42.

The spelling of 21533653626 in words is "twenty-one billion, five hundred thirty-three million, six hundred fifty-three thousand, six hundred twenty-six".