21961468392 has 64 divisors (see below), whose sum is σ = 56126943360. Its totient is φ = 7158777600.

The previous prime is 21961468391. The next prime is 21961468423. The reversal of 21961468392 is 29386416912.

It is not an unprimeable number, because it can be changed into a prime (21961468391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209917 + ... + 296627.

It is an arithmetic number, because the mean of its divisors is an integer number (876983490).

Almost surely, 2^21961468392 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 21961468392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28063471680).

21961468392 is an abundant number, since it is smaller than the sum of its proper divisors (34165474968).

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

21961468392 is a wasteful number, since it uses less digits than its factorization.

21961468392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86954 (or 86950 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The spelling of 21961468392 in words is "twenty-one billion, nine hundred sixty-one million, four hundred sixty-eight thousand, three hundred ninety-two".