22021221240 has 48 divisors (see below), whose sum is σ = 71568970200. Its totient is φ = 5872325568.

The previous prime is 22021221221. The next prime is 22021221241. The reversal of 22021221240 is 4212212022.

22021221240 is a `hidden beast` number, since 2 + 202 + 1 + 221 + 240 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021221241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30584670 + ... + 30585389.

Almost surely, 2^22021221240 is an apocalyptic number.

22021221240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22021221240 is an abundant number, since it is smaller than the sum of its proper divisors (49547748960).

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

22021221240 is a wasteful number, since it uses less digits than its factorization.

22021221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61170076 (or 61170069 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22021221240 its reverse (4212212022), we get a palindrome (26233433262).

The spelling of 22021221240 in words is "twenty-two billion, twenty-one million, two hundred twenty-one thousand, two hundred forty".