121221212010 has 256 divisors, whose sum is σ = 329652633600. Its totient is φ = 28347162624.

The previous prime is 121221212009. The next prime is 121221212023. The reversal of 121221212010 is 10212122121.

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 127 ways as a sum of consecutive naturals, for example, 316504279 + ... + 316504661.

It is an arithmetic number, because the mean of its divisors is an integer number (1287705600).

Almost surely, 2^121221212010 is an apocalyptic number.

121221212010 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 121221212010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164826316800).

121221212010 is an abundant number, since it is smaller than the sum of its proper divisors (208431421590).

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

121221212010 is a wasteful number, since it uses less digits than its factorization.

121221212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885.

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

Adding to 121221212010 its reverse (10212122121), we get a palindrome (131433334131).

The spelling of 121221212010 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, ten".