21201201213 has 32 divisors (see below), whose sum is σ = 29416290816. Its totient is φ = 13572111168.

The previous prime is 21201201199. The next prime is 21201201221. The reversal of 21201201213 is 31210210212.

It is not a de Polignac number, because 21201201213 - 2⁵ = 21201201181 is a prime.

It is a super-2 number, since 2×21201201213² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21201201192 and 21201201201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201201233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4863831 + ... + 4868187.

It is an arithmetic number, because the mean of its divisors is an integer number (919259088).

Almost surely, 2^21201201213 is an apocalyptic number.

It is an amenable number.

21201201213 is a deficient number, since it is larger than the sum of its proper divisors (8215089603).

21201201213 is a wasteful number, since it uses less digits than its factorization.

21201201213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5033.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21201201213 its reverse (31210210212), we get a palindrome (52411411425).

The spelling of 21201201213 in words is "twenty-one billion, two hundred one million, two hundred one thousand, two hundred thirteen".