20011222100 has 36 divisors (see below), whose sum is σ = 43455177024. Its totient is φ = 7998806880.

The previous prime is 20011222073. The next prime is 20011222103. The reversal of 20011222100 is 122211002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011222103) 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, 71987 + ... + 212613.

Almost surely, 2^20011222100 is an apocalyptic number.

20011222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011222100 is an abundant number, since it is smaller than the sum of its proper divisors (23443954924).

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

20011222100 is a wasteful number, since it uses less digits than its factorization.

20011222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142064 (or 142057 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20011222100 its reverse (122211002), we get a palindrome (20133433102).

The spelling of 20011222100 in words is "twenty billion, eleven million, two hundred twenty-two thousand, one hundred".