20021212120200 has 96 divisors (see below), whose sum is σ = 63386305695360. Its totient is φ = 5225394361600.

The previous prime is 20021212120181. The next prime is 20021212120207. The reversal of 20021212120200 is 202121212002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20021212120200.

It is not an unprimeable number, because it can be changed into a prime (20021212120207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 354957831 + ... + 355014230.

It is an arithmetic number, because the mean of its divisors is an integer number (660274017660).

Almost surely, 2^{20021212120200} is an apocalyptic number.

20021212120200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021212120200 is an abundant number, since it is smaller than the sum of its proper divisors (43365093575160).

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

20021212120200 is a wasteful number, since it uses less digits than its factorization.

20021212120200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709972127 (or 709972118 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20021212120200 its reverse (202121212002), we get a palindrome (20223333332202).

The spelling of 20021212120200 in words is "twenty trillion, twenty-one billion, two hundred twelve million, one hundred twenty thousand, two hundred".