22151844 has 108 divisors (see below), whose sum is σ = 66345552. Its totient is φ = 6177600.

The previous prime is 22151819. The next prime is 22151869. The reversal of 22151844 is 44815122.

It is an interprime number because it is at equal distance from previous prime (22151819) and next prime (22151869).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 66759 + ... + 67089.

Almost surely, 2^22151844 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 22151844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33172776).

22151844 is an abundant number, since it is smaller than the sum of its proper divisors (44193708).

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

22151844 is a wasteful number, since it uses less digits than its factorization.

22151844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 360 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 22151844 is about 4706.5745505622. The cubic root of 22151844 is about 280.8471114370.

Adding to 22151844 its reverse (44815122), we get a palindrome (66966966).

Subtracting 22151844 from its reverse (44815122), we obtain a triangular number (22663278 = T₆₇₃₂).

The spelling of 22151844 in words is "twenty-two million, one hundred fifty-one thousand, eight hundred forty-four".