20121342140 has 24 divisors (see below), whose sum is σ = 42257483520. Its totient is φ = 8048029248.

The previous prime is 20121342119. The next prime is 20121342181. The reversal of 20121342140 is 4124312102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604574 + ... + 636986.

It is an arithmetic number, because the mean of its divisors is an integer number (1760728480).

Almost surely, 2^20121342140 is an apocalyptic number.

20121342140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121342140 is an abundant number, since it is smaller than the sum of its proper divisors (22136141380).

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

20121342140 is a wasteful number, since it uses less digits than its factorization.

20121342140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63461 (or 63459 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20121342140 its reverse (4124312102), we get a palindrome (24245654242).

The spelling of 20121342140 in words is "twenty billion, one hundred twenty-one million, three hundred forty-two thousand, one hundred forty".