21212013213121 has 8 divisors (see below), whose sum is σ = 22345730444000. Its totient is φ = 20080025530560.

The previous prime is 21212013213101. The next prime is 21212013213143. The reversal of 21212013213121 is 12131231021212.

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 not a de Polignac number, because 21212013213121 - 2¹⁹ = 21212012688833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212013213092 and 21212013213101.

It is not an unprimeable number, because it can be changed into a prime (21212013213101) 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, 432361896 + ... + 432410953.

It is an arithmetic number, because the mean of its divisors is an integer number (2793216305500).

Almost surely, 2^{21212013213121} is an apocalyptic number.

It is an amenable number.

21212013213121 is a deficient number, since it is larger than the sum of its proper divisors (1133717230879).

21212013213121 is a wasteful number, since it uses less digits than its factorization.

21212013213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864774159.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21212013213121 its reverse (12131231021212), we get a palindrome (33343244234333).

The spelling of 21212013213121 in words is "twenty-one trillion, two hundred twelve billion, thirteen million, two hundred thirteen thousand, one hundred twenty-one".