20211211211021 has 8 divisors (see below), whose sum is σ = 20255665495104. Its totient is φ = 20166761951200.

The previous prime is 20211211210991. The next prime is 20211211211071. The reversal of 20211211211021 is 12011211211202.

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 20211211211021 - 2²² = 20211207016717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211211211071) 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, 6855761 + ... + 9350073.

It is an arithmetic number, because the mean of its divisors is an integer number (2531958186888).

Almost surely, 2^{20211211211021} is an apocalyptic number.

It is an amenable number.

20211211211021 is a deficient number, since it is larger than the sum of its proper divisors (44454284083).

20211211211021 is a wasteful number, since it uses less digits than its factorization.

20211211211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512131.

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

Adding to 20211211211021 its reverse (12011211211202), we get a palindrome (32222422422223).

The spelling of 20211211211021 in words is "twenty trillion, two hundred eleven billion, two hundred eleven million, two hundred eleven thousand, twenty-one".