121542211000 has 128 divisors (see below), whose sum is σ = 329154508800. Its totient is φ = 41143939200.

The previous prime is 121542210997. The next prime is 121542211001. The reversal of 121542211000 is 112245121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121542211001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 443107 + ... + 662893.

It is an arithmetic number, because the mean of its divisors is an integer number (2571519600).

Almost surely, 2^121542211000 is an apocalyptic number.

121542211000 is a gapful number since it is divisible by the number (10) 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 121542211000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164577254400).

121542211000 is an abundant number, since it is smaller than the sum of its proper divisors (207612297800).

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

121542211000 is a wasteful number, since it uses less digits than its factorization.

121542211000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219894 (or 219880 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 121542211000 its reverse (112245121), we get a palindrome (121654456121).

The spelling of 121542211000 in words is "one hundred twenty-one billion, five hundred forty-two million, two hundred eleven thousand".