21366434650 has 48 divisors (see below), whose sum is σ = 43581639168. Its totient is φ = 7728896000.

The previous prime is 21366434587. The next prime is 21366434653. The reversal of 21366434650 is 5643466312.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21366434653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3354 + ... + 206746.

It is an arithmetic number, because the mean of its divisors is an integer number (907950816).

Almost surely, 2^21366434650 is an apocalyptic number.

21366434650 is an abundant number, since it is smaller than the sum of its proper divisors (22215204518).

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

21366434650 is a wasteful number, since it uses less digits than its factorization.

21366434650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203607 (or 203602 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 21366434650 in words is "twenty-one billion, three hundred sixty-six million, four hundred thirty-four thousand, six hundred fifty".