21012322210020 has 72 divisors (see below), whose sum is σ = 63752366144376. Its totient is φ = 5601968228352.

The previous prime is 21012322210007. The next prime is 21012322210057. The reversal of 21012322210020 is 2001222321012.

21012322210020 is a `hidden beast` number, since 210 + 1 + 232 + 221 + 0 + 0 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1591942405284 + 19420379804736 = 1261722^2 + 4406856^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21012322209975 and 21012322210002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12958317 + ... + 14489396.

It is an arithmetic number, because the mean of its divisors is an integer number (885449529783).

Almost surely, 2^{21012322210020} is an apocalyptic number.

21012322210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012322210020 is an abundant number, since it is smaller than the sum of its proper divisors (42740043934356).

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

21012322210020 is a wasteful number, since it uses less digits than its factorization.

21012322210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27451981 (or 27451976 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21012322210020 its reverse (2001222321012), we get a palindrome (23013544531032).

The spelling of 21012322210020 in words is "twenty-one trillion, twelve billion, three hundred twenty-two million, two hundred ten thousand, twenty".