20121121000020 has 48 divisors (see below), whose sum is σ = 56385205349760. Its totient is φ = 5361244976256.

The previous prime is 20121120999949. The next prime is 20121121000039. The reversal of 20121121000020 is 2000012112102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 137028835 + ... + 137175594.

It is an arithmetic number, because the mean of its divisors is an integer number (1174691778120).

Almost surely, 2^{20121121000020} is an apocalyptic number.

20121121000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121121000020 is an abundant number, since it is smaller than the sum of its proper divisors (36264084349740).

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

20121121000020 is a wasteful number, since it uses less digits than its factorization.

20121121000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274205664 (or 274205662 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20121121000020 its reverse (2000012112102), we get a palindrome (22121133112122).

The spelling of 20121121000020 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-one million, twenty", and thus it is an aban number.