20121021140 has 24 divisors (see below), whose sum is σ = 46095430752. Its totient is φ = 7316734880.

The previous prime is 20121021139. The next prime is 20121021149. The reversal of 20121021140 is 4112012102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121021149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45729374 + ... + 45729813.

It is an arithmetic number, because the mean of its divisors is an integer number (1920642948).

Almost surely, 2^20121021140 is an apocalyptic number.

20121021140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121021140 is an abundant number, since it is smaller than the sum of its proper divisors (25974409612).

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

20121021140 is a wasteful number, since it uses less digits than its factorization.

20121021140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91459207 (or 91459205 counting only the distinct ones).

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

Adding to 20121021140 its reverse (4112012102), we get a palindrome (24233033242).

The spelling of 20121021140 in words is "twenty billion, one hundred twenty-one million, twenty-one thousand, one hundred forty".