20211021312 has 80 divisors (see below), whose sum is σ = 54602076672. Its totient is φ = 6642083840.

The previous prime is 20211021287. The next prime is 20211021407. The reversal of 20211021312 is 21312011202.

It is a junction number, because it is equal to n+sod(n) for n = 20211021291 and 20211021300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16393 + ... + 201719.

Almost surely, 2^20211021312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27301038336).

20211021312 is an abundant number, since it is smaller than the sum of its proper divisors (34391055360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20211021312 is an equidigital number, since it uses as much as digits as its factorization.

20211021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185419 (or 185403 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20211021312 its reverse (21312011202), we get a palindrome (41523032514).

The spelling of 20211021312 in words is "twenty billion, two hundred eleven million, twenty-one thousand, three hundred twelve".