121210997 has 4 divisors (see below), whose sum is σ = 121304076. Its totient is φ = 121117920.

The previous prime is 121210951. The next prime is 121211017. The reversal of 121210997 is 799012121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113763556 + 7447441 = 10666^2 + 2729^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210997 - 2⁶ = 121210933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44558 + ... + 47199.

It is an arithmetic number, because the mean of its divisors is an integer number (30326019).

Almost surely, 2^121210997 is an apocalyptic number.

It is an amenable number.

121210997 is a deficient number, since it is larger than the sum of its proper divisors (93079).

121210997 is an equidigital number, since it uses as much as digits as its factorization.

121210997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93078.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 121210997 is about 11009.5865953268. The cubic root of 121210997 is about 494.8960731380.

The spelling of 121210997 in words is "one hundred twenty-one million, two hundred ten thousand, nine hundred ninety-seven".