21887827650 has 144 divisors (see below), whose sum is σ = 63395317440. Its totient is φ = 5382115200.

The previous prime is 21887827649. The next prime is 21887827697. The reversal of 21887827650 is 5672878812.

It is a super-2 number, since 2×21887827650² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9469995 + ... + 9472305.

It is an arithmetic number, because the mean of its divisors is an integer number (440245260).

Almost surely, 2^21887827650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21887827650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31697658720).

21887827650 is an abundant number, since it is smaller than the sum of its proper divisors (41507489790).

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

21887827650 is a wasteful number, since it uses less digits than its factorization.

21887827650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3961 (or 3953 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 54.

The spelling of 21887827650 in words is "twenty-one billion, eight hundred eighty-seven million, eight hundred twenty-seven thousand, six hundred fifty".