21981873150 has 240 divisors, whose sum is σ = 62454150000. Its totient is φ = 5731223040.

The previous prime is 21981873143. The next prime is 21981873157. The reversal of 21981873150 is 5137818912.

It is an interprime number because it is at equal distance from previous prime (21981873143) and next prime (21981873157).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21981873096 and 21981873105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21981873157) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 44051601 + ... + 44052099.

It is an arithmetic number, because the mean of its divisors is an integer number (260225625).

Almost surely, 2^21981873150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21981873150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31227075000).

21981873150 is an abundant number, since it is smaller than the sum of its proper divisors (40472276850).

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

21981873150 is a wasteful number, since it uses less digits than its factorization.

21981873150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 21981873150 in words is "twenty-one billion, nine hundred eighty-one million, eight hundred seventy-three thousand, one hundred fifty".