21221110222010 has 16 divisors (see below), whose sum is σ = 38198051944200. Its totient is φ = 8488432190016.

The previous prime is 21221110221991. The next prime is 21221110222027. The reversal of 21221110222010 is 1022201112212.

It can be written as a sum of positive squares in 4 ways, for example, as 13867885529521 + 7353224692489 = 3723961^2 + 2711683^2 .

It is a super-2 number, since 2×21221110222010² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21221110222010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10978136 + ... + 12765644.

Almost surely, 2^{21221110222010} is an apocalyptic number.

21221110222010 is a deficient number, since it is larger than the sum of its proper divisors (16976941722190).

21221110222010 is a wasteful number, since it uses less digits than its factorization.

21221110222010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2974705.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221110222010 its reverse (1022201112212), we get a palindrome (22243311334222).

The spelling of 21221110222010 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred ten million, two hundred twenty-two thousand, ten".