20130121200440 has 48 divisors (see below), whose sum is σ = 46908448381080. Its totient is φ = 7774391623040.

The previous prime is 20130121200437. The next prime is 20130121200461. The reversal of 20130121200440 is 4400212103102.

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 11 ways as a sum of consecutive naturals, for example, 299165546 + ... + 299232825.

Almost surely, 2^{20130121200440} is an apocalyptic number.

20130121200440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20130121200440 is an abundant number, since it is smaller than the sum of its proper divisors (26778327180640).

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

20130121200440 is a wasteful number, since it uses less digits than its factorization.

20130121200440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598398440 (or 598398407 counting only the distinct ones).

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

Adding to 20130121200440 its reverse (4400212103102), we get a palindrome (24530333303542).

The spelling of 20130121200440 in words is "twenty trillion, one hundred thirty billion, one hundred twenty-one million, two hundred thousand, four hundred forty".