2001212122100 has 72 divisors (see below), whose sum is σ = 4605726547968. Its totient is φ = 753128956800.

The previous prime is 2001212121973. The next prime is 2001212122139. The reversal of 2001212122100 is 12212121002.

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, 6991604 + ... + 7272203.

Almost surely, 2^{2001212122100} is an apocalyptic number.

2001212122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001212122100 is an abundant number, since it is smaller than the sum of its proper divisors (2604514425868).

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

2001212122100 is a wasteful number, since it uses less digits than its factorization.

2001212122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14263905 (or 14263898 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001212122100 its reverse (12212121002), we get a palindrome (2013424243102).

The spelling of 2001212122100 in words is "two trillion, one billion, two hundred twelve million, one hundred twenty-two thousand, one hundred".