21227163144 has 128 divisors (see below), whose sum is σ = 60005404800. Its totient is φ = 6200893440.

The previous prime is 21227163137. The next prime is 21227163163. The reversal of 21227163144 is 44136172212.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1054744 + ... + 1074680.

It is an arithmetic number, because the mean of its divisors is an integer number (468792225).

Almost surely, 2^21227163144 is an apocalyptic number.

21227163144 is a gapful number since it is divisible by the number (24) 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 21227163144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30002702400).

21227163144 is an abundant number, since it is smaller than the sum of its proper divisors (38778241656).

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

21227163144 is a wasteful number, since it uses less digits than its factorization.

21227163144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20103 (or 20099 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The spelling of 21227163144 in words is "twenty-one billion, two hundred twenty-seven million, one hundred sixty-three thousand, one hundred forty-four".