21121626333 has 16 divisors (see below), whose sum is σ = 28338491520. Its totient is φ = 13993189056.

The previous prime is 21121626329. The next prime is 21121626341. The reversal of 21121626333 is 33362612112.

It is not a de Polignac number, because 21121626333 - 2² = 21121626329 is a prime.

It is a super-2 number, since 2×21121626333² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121626333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121626373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287416 + ... + 353342.

It is an arithmetic number, because the mean of its divisors is an integer number (1771155720).

Almost surely, 2^21121626333 is an apocalyptic number.

It is an amenable number.

21121626333 is a deficient number, since it is larger than the sum of its proper divisors (7216865187).

21121626333 is a wasteful number, since it uses less digits than its factorization.

21121626333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66596.

The product of its digits is 7776, while the sum is 30.

The spelling of 21121626333 in words is "twenty-one billion, one hundred twenty-one million, six hundred twenty-six thousand, three hundred thirty-three".