122146721 has 4 divisors (see below), whose sum is σ = 127457472. Its totient is φ = 116835972.

The previous prime is 122146711. The next prime is 122146729. The reversal of 122146721 is 127641221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127641221 = 19 ⋅6717959.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122146721 is a prime.

It is a super-3 number, since 3×122146721³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122146729) 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, 2655341 + ... + 2655386.

It is an arithmetic number, because the mean of its divisors is an integer number (31864368).

Almost surely, 2^122146721 is an apocalyptic number.

It is an amenable number.

122146721 is a deficient number, since it is larger than the sum of its proper divisors (5310751).

122146721 is an equidigital number, since it uses as much as digits as its factorization.

122146721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5310750.

The product of its digits is 1344, while the sum is 26.

The square root of 122146721 is about 11052.0007690915. Note that the first 3 decimals coincide. The cubic root of 122146721 is about 496.1663087488.

Adding to 122146721 its reverse (127641221), we get a palindrome (249787942).

The spelling of 122146721 in words is "one hundred twenty-two million, one hundred forty-six thousand, seven hundred twenty-one".