20001121000 has 64 divisors (see below), whose sum is σ = 53488730880. Its totient is φ = 6857524800.

The previous prime is 20001120977. The next prime is 20001121031. The reversal of 20001121000 is 12110002.

It is a Harshad number since it is a multiple of its sum of digits (7).

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, 1421652 + ... + 1435651.

It is an arithmetic number, because the mean of its divisors is an integer number (835761420).

Almost surely, 2^20001121000 is an apocalyptic number.

20001121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001121000 is an abundant number, since it is smaller than the sum of its proper divisors (33487609880).

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

20001121000 is a wasteful number, since it uses less digits than its factorization.

20001121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857331 (or 2857317 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 20001121000 its reverse (12110002), we get a palindrome (20013231002).

The spelling of 20001121000 in words is "twenty billion, one million, one hundred twenty-one thousand".