21211220201 has 8 divisors (see below), whose sum is σ = 21245898240. Its totient is φ = 21176570752.

The previous prime is 21211220183. The next prime is 21211220227. The reversal of 21211220201 is 10202211212.

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 21211220201 - 2¹⁴ = 21211203817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211220291) 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, 1851176 + ... + 1862598.

It is an arithmetic number, because the mean of its divisors is an integer number (2655737280).

Almost surely, 2^21211220201 is an apocalyptic number.

It is an amenable number.

21211220201 is a deficient number, since it is larger than the sum of its proper divisors (34678039).

21211220201 is a wasteful number, since it uses less digits than its factorization.

21211220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14295.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21211220201 its reverse (10202211212), we get a palindrome (31413431413).

The spelling of 21211220201 in words is "twenty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred one".