121221270 has 96 divisors (see below), whose sum is σ = 331860672. Its totient is φ = 30640896.

The previous prime is 121221241. The next prime is 121221283. The reversal of 121221270 is 72122121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 15.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 324804 + ... + 325176.

It is an arithmetic number, because the mean of its divisors is an integer number (3456882).

Almost surely, 2^121221270 is an apocalyptic number.

121221270 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 121221270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165930336).

121221270 is an abundant number, since it is smaller than the sum of its proper divisors (210639402).

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

121221270 is a wasteful number, since it uses less digits than its factorization.

121221270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 121221270 is about 11010.0531333868. The cubic root of 121221270 is about 494.9100540580.

Adding to 121221270 its reverse (72122121), we get a palindrome (193343391).

The spelling of 121221270 in words is "one hundred twenty-one million, two hundred twenty-one thousand, two hundred seventy".