21010221022 has 16 divisors (see below), whose sum is σ = 36036858240. Its totient is φ = 8999546328.

The previous prime is 21010220999. The next prime is 21010221053. The reversal of 21010221022 is 22012201012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21010220993 and 21010221011.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375772 + ... + 428047.

It is an arithmetic number, because the mean of its divisors is an integer number (2252303640).

Almost surely, 2^21010221022 is an apocalyptic number.

21010221022 is a deficient number, since it is larger than the sum of its proper divisors (15026637218).

21010221022 is a wasteful number, since it uses less digits than its factorization.

21010221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805695.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21010221022 its reverse (22012201012), we get a palindrome (43022422034).

The spelling of 21010221022 in words is "twenty-one billion, ten million, two hundred twenty-one thousand, twenty-two".