220121401 has 4 divisors (see below), whose sum is σ = 222069492. Its totient is φ = 218173312.

The previous prime is 220121393. The next prime is 220121411. The reversal of 220121401 is 104121022.

It is a happy number.

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 18481401 + 201640000 = 4299^2 + 14200^2 .

It is a cyclic number.

It is not a de Polignac number, because 220121401 - 2³ = 220121393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220121411) 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, 973876 + ... + 974101.

It is an arithmetic number, because the mean of its divisors is an integer number (55517373).

Almost surely, 2^220121401 is an apocalyptic number.

It is an amenable number.

220121401 is a deficient number, since it is larger than the sum of its proper divisors (1948091).

220121401 is a wasteful number, since it uses less digits than its factorization.

220121401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948090.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 220121401 is about 14836.4888366486. The cubic root of 220121401 is about 603.7920949064.

Adding to 220121401 its reverse (104121022), we get a palindrome (324242423).

The spelling of 220121401 in words is "two hundred twenty million, one hundred twenty-one thousand, four hundred one".