21152355334 has 24 divisors (see below), whose sum is σ = 34888336560. Its totient is φ = 9611075760.

The previous prime is 21152355299. The next prime is 21152355347. The reversal of 21152355334 is 43355325112.

It is a self number, because there is not a number n which added to its sum of digits gives 21152355334.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 687472 + ... + 717580.

It is an arithmetic number, because the mean of its divisors is an integer number (1453680690).

Almost surely, 2^21152355334 is an apocalyptic number.

21152355334 is a deficient number, since it is larger than the sum of its proper divisors (13735981226).

21152355334 is a wasteful number, since it uses less digits than its factorization.

21152355334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33036 (or 33025 counting only the distinct ones).

The product of its digits is 54000, while the sum is 34.

The spelling of 21152355334 in words is "twenty-one billion, one hundred fifty-two million, three hundred fifty-five thousand, three hundred thirty-four".