21212011211021 has 8 divisors (see below), whose sum is σ = 22116243025920. Its totient is φ = 20319298273008.

The previous prime is 21212011210981. The next prime is 21212011211057. The reversal of 21212011211021 is 12011211021212.

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 21212011211021 - 2²⁶ = 21211944102157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212011211071) 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, 2879715461 + ... + 2879722826.

It is an arithmetic number, because the mean of its divisors is an integer number (2764530378240).

Almost surely, 2^{21212011211021} is an apocalyptic number.

It is an amenable number.

21212011211021 is a deficient number, since it is larger than the sum of its proper divisors (904231814899).

21212011211021 is a wasteful number, since it uses less digits than its factorization.

21212011211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5759438443.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21212011211021 its reverse (12011211021212), we get a palindrome (33223222232233).

It can be divided in two parts, 212 and 12011211021, that multiplied together give a palindrome (2546376736452).

The spelling of 21212011211021 in words is "twenty-one trillion, two hundred twelve billion, eleven million, two hundred eleven thousand, twenty-one".