21022210222021 has 8 divisors (see below), whose sum is σ = 21240403645824. Its totient is φ = 20804891321760.

The previous prime is 21022210222009. The next prime is 21022210222037. The reversal of 21022210222021 is 12022201222012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21022210222021 - 2¹¹ = 21022210219973 is a prime.

It is a super-2 number, since 2×21022210222021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022210222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022210222061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218582560 + ... + 218678713.

It is an arithmetic number, because the mean of its divisors is an integer number (2655050455728).

Almost surely, 2^{21022210222021} is an apocalyptic number.

It is an amenable number.

21022210222021 is a deficient number, since it is larger than the sum of its proper divisors (218193423803).

21022210222021 is a wasteful number, since it uses less digits than its factorization.

21022210222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437261771.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21022210222021 its reverse (12022201222012), we get a palindrome (33044411444033).

Subtracting from 21022210222021 its reverse (12022201222012), we obtain a palindrome (9000009000009).

The spelling of 21022210222021 in words is "twenty-one trillion, twenty-two billion, two hundred ten million, two hundred twenty-two thousand, twenty-one".