121980442 has 4 divisors (see below), whose sum is σ = 182970666. Its totient is φ = 60990220.

The previous prime is 121980421. The next prime is 121980473. The reversal of 121980442 is 244089121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244089121 = 61 ⋅4001461.

It can be written as a sum of positive squares in only one way, i.e., 121022001 + 958441 = 11001^2 + 979^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30495109 + ... + 30495112.

Almost surely, 2^121980442 is an apocalyptic number.

121980442 is a deficient number, since it is larger than the sum of its proper divisors (60990224).

121980442 is an equidigital number, since it uses as much as digits as its factorization.

121980442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60990223.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 121980442 is about 11044.4756326410. The cubic root of 121980442 is about 495.9410618704.

The spelling of 121980442 in words is "one hundred twenty-one million, nine hundred eighty thousand, four hundred forty-two".