21122210211001 has 4 divisors (see below), whose sum is σ = 21122359988452. Its totient is φ = 21122060433552.

The previous prime is 21122210210963. The next prime is 21122210211043. The reversal of 21122210211001 is 10011201222112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13774668107776 + 7347542103225 = 3711424^2 + 2710635^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122210211001 - 2²¹ = 21122208113849 is a prime.

It is a super-2 number, since 2×21122210211001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122210211701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74676990 + ... + 74959303.

It is an arithmetic number, because the mean of its divisors is an integer number (5280589997113).

Almost surely, 2^{21122210211001} is an apocalyptic number.

It is an amenable number.

21122210211001 is a deficient number, since it is larger than the sum of its proper divisors (149777451).

21122210211001 is a wasteful number, since it uses less digits than its factorization.

21122210211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149777450.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21122210211001 its reverse (10011201222112), we get a palindrome (31133411433113).

The spelling of 21122210211001 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred ten million, two hundred eleven thousand, one".