21211010021122 has 4 divisors (see below), whose sum is σ = 31816515031686. Its totient is φ = 10605505010560.

The previous prime is 21211010021057. The next prime is 21211010021129. The reversal of 21211010021122 is 22112001011212.

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

It can be written as a sum of positive squares in only one way, i.e., 21068549822401 + 142460198721 = 4590049^2 + 377439^2 .

It is a super-4 number, since 4×21211010021122⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21211010021096 and 21211010021105.

It is not an unprimeable number, because it can be changed into a prime (21211010021129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302752505279 + ... + 5302752505282.

Almost surely, 2^{21211010021122} is an apocalyptic number.

21211010021122 is a deficient number, since it is larger than the sum of its proper divisors (10605505010564).

21211010021122 is a wasteful number, since it uses less digits than its factorization.

21211010021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605505010563.

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

Adding to 21211010021122 its reverse (22112001011212), we get a palindrome (43323011032334).

The spelling of 21211010021122 in words is "twenty-one trillion, two hundred eleven billion, ten million, twenty-one thousand, one hundred twenty-two".