20101221200 has 30 divisors (see below), whose sum is σ = 48293184894. Its totient is φ = 8040488320.

The previous prime is 20101221193. The next prime is 20101221271. The reversal of 20101221200 is 212210102.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4323851536 + 15777369664 = 65756^2 + 125608^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25126127 + ... + 25126926.

Almost surely, 2^20101221200 is an apocalyptic number.

20101221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101221200 is an abundant number, since it is smaller than the sum of its proper divisors (28191963694).

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

20101221200 is a wasteful number, since it uses less digits than its factorization.

20101221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50253071 (or 50253060 counting only the distinct ones).

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

Adding to 20101221200 its reverse (212210102), we get a palindrome (20313431302).

The spelling of 20101221200 in words is "twenty billion, one hundred one million, two hundred twenty-one thousand, two hundred".