121500072 has 48 divisors (see below), whose sum is σ = 330544500. Its totient is φ = 40317696.

The previous prime is 121500061. The next prime is 121500073. The reversal of 121500072 is 270005121.

It can be written as a sum of positive squares in 2 ways, for example, as 92275236 + 29224836 = 9606^2 + 5406^2 .

It is a super-4 number, since 4×121500072⁴ (a number of 33 digits) contains 4444 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (121500073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12804 + ... + 20172.

Almost surely, 2^121500072 is an apocalyptic number.

121500072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121500072 is an abundant number, since it is smaller than the sum of its proper divisors (209044428).

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

121500072 is a wasteful number, since it uses less digits than its factorization.

121500072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7610 (or 7603 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 121500072 is about 11022.7071085101. The cubic root of 121500072 is about 495.2891851691.

Adding to 121500072 its reverse (270005121), we get a palindrome (391505193).

The spelling of 121500072 in words is "one hundred twenty-one million, five hundred thousand, seventy-two".