122021001 has 6 divisors (see below), whose sum is σ = 176252570. Its totient is φ = 81347328.

The previous prime is 122020979. The next prime is 122021041. The reversal of 122021001 is 100120221.

It can be written as a sum of positive squares in only one way, i.e., 117158976 + 4862025 = 10824^2 + 2205^2 .

It is not a de Polignac number, because 122021001 - 2¹³ = 122012809 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: 13557889 = 122021001 / (1 + 2 + 2 + 0 + 2 + 1 + 0 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (122021041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6778936 + ... + 6778953.

Almost surely, 2^122021001 is an apocalyptic number.

It is an amenable number.

122021001 is a deficient number, since it is larger than the sum of its proper divisors (54231569).

122021001 is a wasteful number, since it uses less digits than its factorization.

122021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13557895 (or 13557892 counting only the distinct ones).

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

The square root of 122021001 is about 11046.3116468801. The cubic root of 122021001 is about 495.9960232620.

Adding to 122021001 its reverse (100120221), we get a palindrome (222141222).

It can be divided in two parts, 12202 and 1001, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 122021001 in words is "one hundred twenty-two million, twenty-one thousand, one".