21202221201 has 16 divisors (see below), whose sum is σ = 34008576000. Its totient is φ = 11477893968.

The previous prime is 21202221181. The next prime is 21202221223. The reversal of 21202221201 is 10212220212.

It is not a de Polignac number, because 21202221201 - 2¹³ = 21202213009 is a prime.

It is a super-2 number, since 2×21202221201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21202221281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26568801 + ... + 26569598.

It is an arithmetic number, because the mean of its divisors is an integer number (2125536000).

Almost surely, 2^21202221201 is an apocalyptic number.

21202221201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21202221201 is a deficient number, since it is larger than the sum of its proper divisors (12806354799).

21202221201 is a wasteful number, since it uses less digits than its factorization.

21202221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53138428.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21202221201 its reverse (10212220212), we get a palindrome (31414441413).

The spelling of 21202221201 in words is "twenty-one billion, two hundred two million, two hundred twenty-one thousand, two hundred one".