200121132440 has 64 divisors (see below), whose sum is σ = 477537910560. Its totient is φ = 75216660480.

The previous prime is 200121132437. The next prime is 200121132479. The reversal of 200121132440 is 44231121002.

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 15 ways as a sum of consecutive naturals, for example, 176795 + ... + 656885.

Almost surely, 2^200121132440 is an apocalyptic number.

200121132440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 200121132440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238768955280).

200121132440 is an abundant number, since it is smaller than the sum of its proper divisors (277416778120).

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

200121132440 is a wasteful number, since it uses less digits than its factorization.

200121132440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480732 (or 480728 counting only the distinct ones).

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

Adding to 200121132440 its reverse (44231121002), we get a palindrome (244352253442).

The spelling of 200121132440 in words is "two hundred billion, one hundred twenty-one million, one hundred thirty-two thousand, four hundred forty".