20211321018 has 32 divisors (see below), whose sum is σ = 46224501120. Its totient is φ = 5771263680.

The previous prime is 20211320999. The next prime is 20211321019. The reversal of 20211321018 is 81012311202.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20211320985 and 20211321003.

It is not an unprimeable number, because it can be changed into a prime (20211321019) 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, 69013 + ... + 212568.

It is an arithmetic number, because the mean of its divisors is an integer number (1444515660).

Almost surely, 2^20211321018 is an apocalyptic number.

20211321018 is an abundant number, since it is smaller than the sum of its proper divisors (26013180102).

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

20211321018 is a wasteful number, since it uses less digits than its factorization.

20211321018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283302.

The product of its (nonzero) digits is 192, while the sum is 21.

The spelling of 20211321018 in words is "twenty billion, two hundred eleven million, three hundred twenty-one thousand, eighteen".