121445620 has 96 divisors (see below), whose sum is σ = 284407200. Its totient is φ = 43352064.

The previous prime is 121445617. The next prime is 121445629. The reversal of 121445620 is 26544121.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 30891364 + 90554256 = 5558^2 + 9516^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121445629) 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, 1074684 + ... + 1074796.

It is an arithmetic number, because the mean of its divisors is an integer number (2962575).

Almost surely, 2^121445620 is an apocalyptic number.

121445620 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 121445620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142203600).

121445620 is an abundant number, since it is smaller than the sum of its proper divisors (162961580).

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

121445620 is a wasteful number, since it uses less digits than its factorization.

121445620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 121445620 is about 11020.2368395602. The cubic root of 121445620 is about 495.2151837955.

Adding to 121445620 its reverse (26544121), we get a palindrome (147989741).

The spelling of 121445620 in words is "one hundred twenty-one million, four hundred forty-five thousand, six hundred twenty".