21212110220001 has 16 divisors (see below), whose sum is σ = 28999995931584. Its totient is φ = 13786214629824.

The previous prime is 21212110219999. The next prime is 21212110220047. The reversal of 21212110220001 is 10002201121212.

It is not a de Polignac number, because 21212110220001 - 2¹ = 21212110219999 is a prime.

It is a super-3 number, since 3×21212110220001³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212110220051) 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, 424846051 + ... + 424895976.

It is an arithmetic number, because the mean of its divisors is an integer number (1812499745724).

Almost surely, 2^{21212110220001} is an apocalyptic number.

It is an amenable number.

21212110220001 is a deficient number, since it is larger than the sum of its proper divisors (7787885711583).

21212110220001 is a wasteful number, since it uses less digits than its factorization.

21212110220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849742240.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212110220001 its reverse (10002201121212), we get a palindrome (31214311341213).

The spelling of 21212110220001 in words is "twenty-one trillion, two hundred twelve billion, one hundred ten million, two hundred twenty thousand, one".