20210211011221 has 16 divisors (see below), whose sum is σ = 25446622900608. Its totient is φ = 15592293432000.

The previous prime is 20210211011143. The next prime is 20210211011261. The reversal of 20210211011221 is 12211011201202.

It is a cyclic number.

It is not a de Polignac number, because 20210211011221 - 2¹¹ = 20210211009173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210211011195 and 20210211011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210211011261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1299350010 + ... + 1299365563.

It is an arithmetic number, because the mean of its divisors is an integer number (1590413931288).

Almost surely, 2^{20210211011221} is an apocalyptic number.

It is an amenable number.

20210211011221 is a deficient number, since it is larger than the sum of its proper divisors (5236411889387).

20210211011221 is a wasteful number, since it uses less digits than its factorization.

20210211011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2598715692.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20210211011221 its reverse (12211011201202), we get a palindrome (32421222212423).

The spelling of 20210211011221 in words is "twenty trillion, two hundred ten billion, two hundred eleven million, eleven thousand, two hundred twenty-one".