21012221110011 has 8 divisors (see below), whose sum is σ = 28158509508624. Its totient is φ = 13937040059040.

The previous prime is 21012221110003. The next prime is 21012221110021. The reversal of 21012221110011 is 11001112221012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21012221110011 - 2³ = 21012221110003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012221110021) 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, 17776836220 + ... + 17776837401.

It is an arithmetic number, because the mean of its divisors is an integer number (3519813688578).

Almost surely, 2^{21012221110011} is an apocalyptic number.

21012221110011 is a deficient number, since it is larger than the sum of its proper divisors (7146288398613).

21012221110011 is a wasteful number, since it uses less digits than its factorization.

21012221110011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35553673821.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21012221110011 its reverse (11001112221012), we get a palindrome (32013333331023).

The spelling of 21012221110011 in words is "twenty-one trillion, twelve billion, two hundred twenty-one million, one hundred ten thousand, eleven".