21211010021213 has 8 divisors (see below), whose sum is σ = 21218107489920. Its totient is φ = 21203913495520.

The previous prime is 21211010021171. The next prime is 21211010021221. The reversal of 21211010021213 is 31212001011212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211010021213 is a prime.

It is a super-2 number, since 2×21211010021213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21211010021191 and 21211010021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211010021293) 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, 46282556 + ... + 46738602.

It is an arithmetic number, because the mean of its divisors is an integer number (2652263436240).

Almost surely, 2^{21211010021213} is an apocalyptic number.

It is an amenable number.

21211010021213 is a deficient number, since it is larger than the sum of its proper divisors (7097468707).

21211010021213 is a wasteful number, since it uses less digits than its factorization.

21211010021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471507.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21211010021213 its reverse (31212001011212), we get a palindrome (52423011032425).

The spelling of 21211010021213 in words is "twenty-one trillion, two hundred eleven billion, ten million, twenty-one thousand, two hundred thirteen".