122001021 has 6 divisors (see below), whose sum is σ = 176223710. Its totient is φ = 81334008.

The previous prime is 122001013. The next prime is 122001041. The reversal of 122001021 is 120100221.

It can be written as a sum of positive squares in only one way, i.e., 75951225 + 46049796 = 8715^2 + 6786^2 .

It is not a de Polignac number, because 122001021 - 2³ = 122001013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 13555669 = 122001021 / (1 + 2 + 2 + 0 + 0 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122000994 and 122001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122001001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6777826 + ... + 6777843.

Almost surely, 2^122001021 is an apocalyptic number.

It is an amenable number.

122001021 is a deficient number, since it is larger than the sum of its proper divisors (54222689).

122001021 is a wasteful number, since it uses less digits than its factorization.

122001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13555675 (or 13555672 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 122001021 is about 11045.4072355889. The cubic root of 122001021 is about 495.9689499402.

Adding to 122001021 its reverse (120100221), we get a palindrome (242101242).

The spelling of 122001021 in words is "one hundred twenty-two million, one thousand, twenty-one".