21001120022 has 4 divisors (see below), whose sum is σ = 31501680036. Its totient is φ = 10500560010.

The previous prime is 21001120013. The next prime is 21001120073. The reversal of 21001120022 is 22002110012.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21001119985 and 21001120012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250280004 + ... + 5250280007.

It is an arithmetic number, because the mean of its divisors is an integer number (7875420009).

Almost surely, 2^21001120022 is an apocalyptic number.

21001120022 is a deficient number, since it is larger than the sum of its proper divisors (10500560014).

21001120022 is a wasteful number, since it uses less digits than its factorization.

21001120022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500560013.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21001120022 its reverse (22002110012), we get a palindrome (43003230034).

The spelling of 21001120022 in words is "twenty-one billion, one million, one hundred twenty thousand, twenty-two".