2221012100 has 18 divisors (see below), whose sum is σ = 4819596474. Its totient is φ = 888404800.

The previous prime is 2221012097. The next prime is 2221012103. The reversal of 2221012100 is 12101222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2221012097) and next prime (2221012103).

It can be written as a sum of positive squares in 3 ways, for example, as 140375104 + 2080636996 = 11848^2 + 45614^2 .

It is not an unprimeable number, because it can be changed into a prime (2221012103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11104961 + ... + 11105160.

Almost surely, 2^2221012100 is an apocalyptic number.

2221012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221012100 is an abundant number, since it is smaller than the sum of its proper divisors (2598584374).

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

2221012100 is a wasteful number, since it uses less digits than its factorization.

2221012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22210135 (or 22210128 counting only the distinct ones).

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

The square root of 2221012100 is about 47127.6150468067. The cubic root of 2221012100 is about 1304.7189639633.

Adding to 2221012100 its reverse (12101222), we get a palindrome (2233113322).

The spelling of 2221012100 in words is "two billion, two hundred twenty-one million, twelve thousand, one hundred".