21111021201213 has 10 divisors (see below), whose sum is σ = 31536216856254. Its totient is φ = 14074014134088.

The previous prime is 21111021201181. The next prime is 21111021201271. The reversal of 21111021201213 is 31210212011112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15772828136004 + 5338193065209 = 3971502^2 + 2310453^2 .

It is not a de Polignac number, because 21111021201213 - 2⁵ = 21111021201181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111021201313) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 130314945606 + ... + 130314945767.

Almost surely, 2^{21111021201213} is an apocalyptic number.

It is an amenable number.

21111021201213 is a deficient number, since it is larger than the sum of its proper divisors (10425195655041).

21111021201213 is an equidigital number, since it uses as much as digits as its factorization.

21111021201213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260629891385 (or 260629891376 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21111021201213 its reverse (31210212011112), we get a palindrome (52321233212325).

The spelling of 21111021201213 in words is "twenty-one trillion, one hundred eleven billion, twenty-one million, two hundred one thousand, two hundred thirteen".