22001212112220 has 168 divisors, whose sum is σ = 75569596003440. Its totient is φ = 5333627139840.

The previous prime is 22001212112147. The next prime is 22001212112221. The reversal of 22001212112220 is 2221121210022.

It is a happy number.

22001212112220 is a `hidden beast` number, since 220 + 0 + 1 + 212 + 1 + 12 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 22001212112193 and 22001212112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001212112221) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 68430505 + ... + 68751264.

It is an arithmetic number, because the mean of its divisors is an integer number (449819023830).

Almost surely, 2^{22001212112220} is an apocalyptic number.

22001212112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001212112220 is an abundant number, since it is smaller than the sum of its proper divisors (53568383891220).

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

22001212112220 is a wasteful number, since it uses less digits than its factorization.

22001212112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137181807 (or 137181790 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22001212112220 its reverse (2221121210022), we get a palindrome (24222333322242).

The spelling of 22001212112220 in words is "twenty-two trillion, one billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty".