21031201 has 8 divisors (see below), whose sum is σ = 21312000. Its totient is φ = 20752560.

The previous prime is 21031187. The next prime is 21031217. The reversal of 21031201 is 10213012.

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 21031201 - 2⁵ = 21031169 is a prime.

It is a super-2 number, since 2×21031201² = 884622831004802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031291) 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, 28090 + ... + 28828.

It is an arithmetic number, because the mean of its divisors is an integer number (2664000).

Almost surely, 2^21031201 is an apocalyptic number.

It is an amenable number.

21031201 is a deficient number, since it is larger than the sum of its proper divisors (280799).

21031201 is a wasteful number, since it uses less digits than its factorization.

21031201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21031201 is about 4585.9787395931. The cubic root of 21031201 is about 276.0289868386.

Adding to 21031201 its reverse (10213012), we get a palindrome (31244213).

The spelling of 21031201 in words is "twenty-one million, thirty-one thousand, two hundred one".