21938061000 has 128 divisors (see below), whose sum is σ = 68830819200. Its totient is φ = 5817324800.

The previous prime is 21938060981. The next prime is 21938061001. The reversal of 21938061000 is 16083912.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21938061001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 516574 + ... + 557426.

It is an arithmetic number, because the mean of its divisors is an integer number (537740775).

Almost surely, 2^21938061000 is an apocalyptic number.

21938061000 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 21938061000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34415409600).

21938061000 is an abundant number, since it is smaller than the sum of its proper divisors (46892758200).

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

21938061000 is a wasteful number, since it uses less digits than its factorization.

21938061000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41056 (or 41042 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The spelling of 21938061000 in words is "twenty-one billion, nine hundred thirty-eight million, sixty-one thousand".