121635342020 has 24 divisors (see below), whose sum is σ = 255448019904. Its totient is φ = 48651507936.

The previous prime is 121635341983. The next prime is 121635342029. The reversal of 121635342020 is 20243536121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121635342029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239279 + ... + 548201.

It is an arithmetic number, because the mean of its divisors is an integer number (10643667496).

Almost surely, 2^121635342020 is an apocalyptic number.

121635342020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121635342020 is an abundant number, since it is smaller than the sum of its proper divisors (133812677884).

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

121635342020 is a wasteful number, since it uses less digits than its factorization.

121635342020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328619 (or 328617 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 121635342020 its reverse (20243536121), we get a palindrome (141878878141).

The spelling of 121635342020 in words is "one hundred twenty-one billion, six hundred thirty-five million, three hundred forty-two thousand, twenty".