21273906798 has 96 divisors (see below), whose sum is σ = 50160337920. Its totient is φ = 6676356960.

The previous prime is 21273906791. The next prime is 21273906803. The reversal of 21273906798 is 89760937212.

It is a super-2 number, since 2×21273906798² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21273906791) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2287065 + ... + 2296347.

It is an arithmetic number, because the mean of its divisors is an integer number (522503520).

Almost surely, 2^21273906798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21273906798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25080168960).

21273906798 is an abundant number, since it is smaller than the sum of its proper divisors (28886431122).

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

21273906798 is a wasteful number, since it uses less digits than its factorization.

21273906798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9399 (or 9356 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 21273906798 in words is "twenty-one billion, two hundred seventy-three million, nine hundred six thousand, seven hundred ninety-eight".