20001211211200 has 84 divisors (see below), whose sum is σ = 49220818566040. Its totient is φ = 7999616701440.

The previous prime is 20001211211197. The next prime is 20001211211203. The reversal of 20001211211200 is 211211210002.

It is an interprime number because it is at equal distance from previous prime (20001211211197) and next prime (20001211211203).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001211211203) 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, 14179486 + ... + 15526114.

Almost surely, 2^{20001211211200} is an apocalyptic number.

20001211211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001211211200 is an abundant number, since it is smaller than the sum of its proper divisors (29219607354840).

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

20001211211200 is a wasteful number, since it uses less digits than its factorization.

20001211211200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355934 (or 1355919 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20001211211200 its reverse (211211210002), we get a palindrome (20212422421202).

The spelling of 20001211211200 in words is "twenty trillion, one billion, two hundred eleven million, two hundred eleven thousand, two hundred".