20213121004200 has 144 divisors (see below), whose sum is σ = 68140507612320. Its totient is φ = 5369670549120.

The previous prime is 20213121004177. The next prime is 20213121004213. The reversal of 20213121004200 is 240012131202.

It is a happy number.

20213121004200 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 31 + 210 + 0 + 420 + 0 = 666.

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 35 ways as a sum of consecutive naturals, for example, 20875482 + ... + 21822281.

It is an arithmetic number, because the mean of its divisors is an integer number (473197969530).

Almost surely, 2^{20213121004200} is an apocalyptic number.

20213121004200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20213121004200 is an abundant number, since it is smaller than the sum of its proper divisors (47927386608120).

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

20213121004200 is a wasteful number, since it uses less digits than its factorization.

20213121004200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42698048 (or 42698036 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20213121004200 its reverse (240012131202), we get a palindrome (20453133135402).

The spelling of 20213121004200 in words is "twenty trillion, two hundred thirteen billion, one hundred twenty-one million, four thousand, two hundred".