220521401 has 8 divisors (see below), whose sum is σ = 230277120. Its totient is φ = 210779712.

The previous prime is 220521397. The next prime is 220521407. The reversal of 220521401 is 104125022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220521401 - 2² = 220521397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220521401.

It is not an unprimeable number, because it can be changed into a prime (220521407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40520 + ... + 45638.

It is an arithmetic number, because the mean of its divisors is an integer number (28784640).

Almost surely, 2^220521401 is an apocalyptic number.

It is an amenable number.

220521401 is a deficient number, since it is larger than the sum of its proper divisors (9755719).

220521401 is a wasteful number, since it uses less digits than its factorization.

220521401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 220521401 is about 14849.9629965869. The cubic root of 220521401 is about 604.1576063791.

Adding to 220521401 its reverse (104125022), we get a palindrome (324646423).

The spelling of 220521401 in words is "two hundred twenty million, five hundred twenty-one thousand, four hundred one".