2021222212200 has 72 divisors (see below), whose sum is σ = 6787937935350. Its totient is φ = 538992589440.

The previous prime is 2021222212171. The next prime is 2021222212249. The reversal of 2021222212200 is 22122221202.

2021222212200 is a `hidden beast` number, since 20 + 212 + 22 + 212 + 200 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1121824142244 + 899398069956 = 1059162^2 + 948366^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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 17 ways as a sum of consecutive naturals, for example, 561448815 + ... + 561452414.

Almost surely, 2^{2021222212200} is an apocalyptic number.

2021222212200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021222212200 is an abundant number, since it is smaller than the sum of its proper divisors (4766715723150).

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

2021222212200 is a wasteful number, since it uses less digits than its factorization.

2021222212200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122901251 (or 1122901239 counting only the distinct ones).

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

Adding to 2021222212200 its reverse (22122221202), we get a palindrome (2043344433402).

The spelling of 2021222212200 in words is "two trillion, twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred".