21022401 has 8 divisors (see below), whose sum is σ = 28787584. Its totient is φ = 13636080.

The previous prime is 21022373. The next prime is 21022411. The reversal of 21022401 is 10422012.

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

It is not a de Polignac number, because 21022401 - 2¹¹ = 21020353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022411) 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, 94585 + ... + 94806.

It is an arithmetic number, because the mean of its divisors is an integer number (3598448).

Almost surely, 2^21022401 is an apocalyptic number.

It is an amenable number.

21022401 is a deficient number, since it is larger than the sum of its proper divisors (7765183).

21022401 is a wasteful number, since it uses less digits than its factorization.

21022401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189431.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21022401 is about 4585.0191929805. The cubic root of 21022401 is about 275.9904822385.

Adding to 21022401 its reverse (10422012), we get a palindrome (31444413).

The spelling of 21022401 in words is "twenty-one million, twenty-two thousand, four hundred one".