21623279340 has 384 divisors, whose sum is σ = 71530905600. Its totient is φ = 4836142080.

The previous prime is 21623279303. The next prime is 21623279341. The reversal of 21623279340 is 4397232612.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21623279341) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 32811931 + ... + 32812589.

It is an arithmetic number, because the mean of its divisors is an integer number (186278400).

Almost surely, 2^21623279340 is an apocalyptic number.

21623279340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21623279340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35765452800).

21623279340 is an abundant number, since it is smaller than the sum of its proper divisors (49907626260).

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

21623279340 is a wasteful number, since it uses less digits than its factorization.

21623279340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 39.

The spelling of 21623279340 in words is "twenty-one billion, six hundred twenty-three million, two hundred seventy-nine thousand, three hundred forty".