21012220221101 has 8 divisors (see below), whose sum is σ = 21741372281880. Its totient is φ = 20283374343232.

The previous prime is 21012220221053. The next prime is 21012220221143. The reversal of 21012220221101 is 10112202221012.

It can be written as a sum of positive squares in 4 ways, for example, as 25880443876 + 20986339777225 = 160874^2 + 4581085^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012220221101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21012220221101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012220221301) 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, 76406090 + ... + 76680603.

It is an arithmetic number, because the mean of its divisors is an integer number (2717671535235).

Almost surely, 2^{21012220221101} is an apocalyptic number.

It is an amenable number.

21012220221101 is a deficient number, since it is larger than the sum of its proper divisors (729152060779).

21012220221101 is a wasteful number, since it uses less digits than its factorization.

21012220221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153091455.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012220221101 its reverse (10112202221012), we get a palindrome (31124422442113).

The spelling of 21012220221101 in words is "twenty-one trillion, twelve billion, two hundred twenty million, two hundred twenty-one thousand, one hundred one".