22001051540 has 96 divisors (see below), whose sum is σ = 52331360256. Its totient is φ = 7712939520.

The previous prime is 22001051519. The next prime is 22001051563. The reversal of 22001051540 is 4515010022.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 401429 + ... + 452931.

It is an arithmetic number, because the mean of its divisors is an integer number (545118336).

Almost surely, 2^22001051540 is an apocalyptic number.

22001051540 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 22001051540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26165680128).

22001051540 is an abundant number, since it is smaller than the sum of its proper divisors (30330308716).

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

22001051540 is a wasteful number, since it uses less digits than its factorization.

22001051540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51609 (or 51607 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 22001051540 its reverse (4515010022), we get a palindrome (26516061562).

The spelling of 22001051540 in words is "twenty-two billion, one million, fifty-one thousand, five hundred forty".