21154374276 has 144 divisors (see below), whose sum is σ = 58280302080. Its totient is φ = 5954135040.

The previous prime is 21154374271. The next prime is 21154374287. The reversal of 21154374276 is 67247345112.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (21154374271) 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, 12025485 + ... + 12027243.

It is an arithmetic number, because the mean of its divisors is an integer number (404724320).

Almost surely, 2^21154374276 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21154374276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29140151040).

21154374276 is an abundant number, since it is smaller than the sum of its proper divisors (37125927804).

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

21154374276 is a wasteful number, since it uses less digits than its factorization.

21154374276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074 (or 2065 counting only the distinct ones).

The product of its digits is 282240, while the sum is 42.

The spelling of 21154374276 in words is "twenty-one billion, one hundred fifty-four million, three hundred seventy-four thousand, two hundred seventy-six".