21910155616 has 96 divisors (see below), whose sum is σ = 45243152640. Its totient is φ = 10434479616.

The previous prime is 21910155601. The next prime is 21910155647. The reversal of 21910155616 is 61655101912.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14198941 + ... + 14200483.

It is an arithmetic number, because the mean of its divisors is an integer number (471282840).

Almost surely, 2^21910155616 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 21910155616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22621576320).

21910155616 is an abundant number, since it is smaller than the sum of its proper divisors (23332997024).

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

21910155616 is a wasteful number, since it uses less digits than its factorization.

21910155616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836 (or 1828 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 37.

The spelling of 21910155616 in words is "twenty-one billion, nine hundred ten million, one hundred fifty-five thousand, six hundred sixteen".