20121525140 has 12 divisors (see below), whose sum is σ = 42255202836. Its totient is φ = 8048610048.

The previous prime is 20121525119. The next prime is 20121525169. The reversal of 20121525140 is 4152512102.

It can be written as a sum of positive squares in 2 ways, for example, as 10198576144 + 9922948996 = 100988^2 + 99614^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503038109 + ... + 503038148.

It is an arithmetic number, because the mean of its divisors is an integer number (3521266903).

Almost surely, 2^20121525140 is an apocalyptic number.

20121525140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121525140 is an abundant number, since it is smaller than the sum of its proper divisors (22133677696).

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

20121525140 is a wasteful number, since it uses less digits than its factorization.

20121525140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006076266 (or 1006076264 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The spelling of 20121525140 in words is "twenty billion, one hundred twenty-one million, five hundred twenty-five thousand, one hundred forty".