201121100021000 has 64 divisors (see below), whose sum is σ = 477647603671680. Its totient is φ = 79247716996800.

The previous prime is 201121100020957. The next prime is 201121100021077. The reversal of 201121100021000 is 120001121102.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1500836732 + ... + 1500970731.

It is an arithmetic number, because the mean of its divisors is an integer number (7463243807370).

Almost surely, 2^{201121100021000} is an apocalyptic number.

201121100021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201121100021000 is an abundant number, since it is smaller than the sum of its proper divisors (276526503650680).

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

201121100021000 is a wasteful number, since it uses less digits than its factorization.

201121100021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3001807551 (or 3001807537 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201121100021000 its reverse (120001121102), we get a palindrome (201241101142102).

The spelling of 201121100021000 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred million, twenty-one thousand".