22151340 has 192 divisors, whose sum is σ = 77414400. Its totient is φ = 5225472.

The previous prime is 22151281. The next prime is 22151411. The reversal of 22151340 is 4315122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 174357 + ... + 174483.

It is an arithmetic number, because the mean of its divisors is an integer number (403200).

Almost surely, 2^22151340 is an apocalyptic number.

22151340 is a gapful number since it is divisible by the number (20) 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 22151340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38707200).

22151340 is an abundant number, since it is smaller than the sum of its proper divisors (55263060).

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

22151340 is a wasteful number, since it uses less digits than its factorization.

22151340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 22151340 is about 4706.5210081333. The cubic root of 22151340 is about 280.8449814711.

Adding to 22151340 its reverse (4315122), we get a palindrome (26466462).

The spelling of 22151340 in words is "twenty-two million, one hundred fifty-one thousand, three hundred forty".