21021111022 has 4 divisors (see below), whose sum is σ = 31531666536. Its totient is φ = 10510555510.

The previous prime is 21021110989. The next prime is 21021111029. The reversal of 21021111022 is 22011112012.

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 = 21021110993 and 21021111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021111029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255277754 + ... + 5255277757.

It is an arithmetic number, because the mean of its divisors is an integer number (7882916634).

Almost surely, 2^21021111022 is an apocalyptic number.

21021111022 is a deficient number, since it is larger than the sum of its proper divisors (10510555514).

21021111022 is a wasteful number, since it uses less digits than its factorization.

21021111022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510555513.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21021111022 its reverse (22011112012), we get a palindrome (43032223034).

The spelling of 21021111022 in words is "twenty-one billion, twenty-one million, one hundred eleven thousand, twenty-two".