20121090136 has 64 divisors (see below), whose sum is σ = 46492992000. Its totient is φ = 7970192640.

The previous prime is 20121090091. The next prime is 20121090137. The reversal of 20121090136 is 63109012102.

It is a super-3 number, since 3×20121090136³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 20121090136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121090137) 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 15 ways as a sum of consecutive naturals, for example, 186996 + ... + 274243.

It is an arithmetic number, because the mean of its divisors is an integer number (726453000).

Almost surely, 2^20121090136 is an apocalyptic number.

It is an amenable number.

20121090136 is an abundant number, since it is smaller than the sum of its proper divisors (26371901864).

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

20121090136 is a wasteful number, since it uses less digits than its factorization.

20121090136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461312 (or 461308 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 20121090136 in words is "twenty billion, one hundred twenty-one million, ninety thousand, one hundred thirty-six".