20212021321 has 8 divisors (see below), whose sum is σ = 20380852800. Its totient is φ = 20043859248.

The previous prime is 20212021283. The next prime is 20212021331. The reversal of 20212021321 is 12312021202.

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 a de Polignac number, because none of the positive numbers 2^k-20212021321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212021295 and 20212021304.

It is not an unprimeable number, because it can be changed into a prime (20212021331) 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, 106621 + ... + 227578.

It is an arithmetic number, because the mean of its divisors is an integer number (2547606600).

Almost surely, 2^20212021321 is an apocalyptic number.

It is an amenable number.

20212021321 is a deficient number, since it is larger than the sum of its proper divisors (168831479).

20212021321 is a wasteful number, since it uses less digits than its factorization.

20212021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334703.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20212021321 its reverse (12312021202), we get a palindrome (32524042523).

The spelling of 20212021321 in words is "twenty billion, two hundred twelve million, twenty-one thousand, three hundred twenty-one".