21010021022 has 16 divisors (see below), whose sum is σ = 32372389392. Its totient is φ = 10219322880.

The previous prime is 21010020991. The next prime is 21010021027. The reversal of 21010021022 is 22012001012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21010020994 and 21010021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010021027) by changing a digit.

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, 473918 + ... + 516350.

It is an arithmetic number, because the mean of its divisors is an integer number (2023274337).

Almost surely, 2^21010021022 is an apocalyptic number.

21010021022 is a deficient number, since it is larger than the sum of its proper divisors (11362368370).

21010021022 is a wasteful number, since it uses less digits than its factorization.

21010021022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49163.

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

Adding to 21010021022 its reverse (22012001012), we get a palindrome (43022022034).

The spelling of 21010021022 in words is "twenty-one billion, ten million, twenty-one thousand, twenty-two".