21011011022 has 4 divisors (see below), whose sum is σ = 31516516536. Its totient is φ = 10505505510.

The previous prime is 21011010973. The next prime is 21011011033. The reversal of 21011011022 is 22011011012.

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 = 21011010994 and 21011011012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252752754 + ... + 5252752757.

It is an arithmetic number, because the mean of its divisors is an integer number (7879129134).

Almost surely, 2^21011011022 is an apocalyptic number.

21011011022 is a deficient number, since it is larger than the sum of its proper divisors (10505505514).

21011011022 is a wasteful number, since it uses less digits than its factorization.

21011011022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10505505513.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011011022 its reverse (22011011012), we get a palindrome (43022022034).

The spelling of 21011011022 in words is "twenty-one billion, eleven million, eleven thousand, twenty-two".