2120021222100 has 72 divisors (see below), whose sum is σ = 6135602171328. Its totient is φ = 565184697600.

The previous prime is 2120021222083. The next prime is 2120021222141. The reversal of 2120021222100 is 12221200212.

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 2120021222100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138792 + ... + 2063808.

It is an arithmetic number, because the mean of its divisors is an integer number (85216696824).

Almost surely, 2^{2120021222100} is an apocalyptic number.

2120021222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2120021222100 is an abundant number, since it is smaller than the sum of its proper divisors (4015580949228).

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

2120021222100 is a wasteful number, since it uses less digits than its factorization.

2120021222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928705 (or 1928698 counting only the distinct ones).

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

Adding to 2120021222100 its reverse (12221200212), we get a palindrome (2132242422312).

The spelling of 2120021222100 in words is "two trillion, one hundred twenty billion, twenty-one million, two hundred twenty-two thousand, one hundred".