21974004000 has 1152 divisors, whose sum is σ = 91352282112. Its totient is φ = 5150822400.

The previous prime is 21974003957. The next prime is 21974004001. The reversal of 21974004000 is 40047912.

It is a happy number.

21974004000 is a `hidden beast` number, since 219 + 7 + 40 + 0 + 400 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21974004001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 467531977 + ... + 467532023.

It is an arithmetic number, because the mean of its divisors is an integer number (79298856).

Almost surely, 2^21974004000 is an apocalyptic number.

21974004000 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 21974004000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45676141056).

21974004000 is an abundant number, since it is smaller than the sum of its proper divisors (69378278112).

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

21974004000 is a wasteful number, since it uses less digits than its factorization.

21974004000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The spelling of 21974004000 in words is "twenty-one billion, nine hundred seventy-four million, four thousand".