121221221010 has 64 divisors (see below), whose sum is σ = 304305361920. Its totient is φ = 30846326720.

The previous prime is 121221220961. The next prime is 121221221021. The reversal of 121221221010 is 10122122121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79465 + ... + 498755.

It is an arithmetic number, because the mean of its divisors is an integer number (4754771280).

Almost surely, 2^121221221010 is an apocalyptic number.

121221221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121221221010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152152680960).

121221221010 is an abundant number, since it is smaller than the sum of its proper divisors (183084140910).

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

121221221010 is a wasteful number, since it uses less digits than its factorization.

121221221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419743.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121221221010 its reverse (10122122121), we get a palindrome (131343343131).

The spelling of 121221221010 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, ten".