20212001321 has 4 divisors (see below), whose sum is σ = 20226788352. Its totient is φ = 20197214292.

The previous prime is 20212001311. The next prime is 20212001353. The reversal of 20212001321 is 12310021202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20212001321 - 2²⁶ = 20144892457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212001296 and 20212001305.

It is not an unprimeable number, because it can be changed into a prime (20212001311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7391465 + ... + 7394198.

It is an arithmetic number, because the mean of its divisors is an integer number (5056697088).

Almost surely, 2^20212001321 is an apocalyptic number.

It is an amenable number.

20212001321 is a deficient number, since it is larger than the sum of its proper divisors (14787031).

20212001321 is a wasteful number, since it uses less digits than its factorization.

20212001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14787030.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20212001321 its reverse (12310021202), we get a palindrome (32522022523).

The spelling of 20212001321 in words is "twenty billion, two hundred twelve million, one thousand, three hundred twenty-one".