20211132202421 has 4 divisors (see below), whose sum is σ = 20211261259212. Its totient is φ = 20211003145632.

The previous prime is 20211132202363. The next prime is 20211132202433. The reversal of 20211132202421 is 12420223111202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12766228956196 + 7444903246225 = 3572986^2 + 2728535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211132202421 is a prime.

It is a super-2 number, since 2×20211132202421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211132204421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64293200 + ... + 64606793.

It is an arithmetic number, because the mean of its divisors is an integer number (5052815314803).

Almost surely, 2^{20211132202421} is an apocalyptic number.

It is an amenable number.

20211132202421 is a deficient number, since it is larger than the sum of its proper divisors (129056791).

20211132202421 is a wasteful number, since it uses less digits than its factorization.

20211132202421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129056790.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 20211132202421 its reverse (12420223111202), we get a palindrome (32631355313623).

The spelling of 20211132202421 in words is "twenty trillion, two hundred eleven billion, one hundred thirty-two million, two hundred two thousand, four hundred twenty-one".