21340108972 has 288 divisors, whose sum is σ = 50714087424. Its totient is φ = 7772889600.

The previous prime is 21340108969. The next prime is 21340108973. The reversal of 21340108972 is 27980104312.

It is not an unprimeable number, because it can be changed into a prime (21340108973) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 207185473 + ... + 207185575.

Almost surely, 2^21340108972 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 21340108972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25357043712).

21340108972 is an abundant number, since it is smaller than the sum of its proper divisors (29373978452).

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

21340108972 is a wasteful number, since it uses less digits than its factorization.

21340108972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 21340108972 in words is "twenty-one billion, three hundred forty million, one hundred eight thousand, nine hundred seventy-two".