21221001121036 has 24 divisors (see below), whose sum is σ = 40044764637360. Its totient is φ = 9806881132800.

The previous prime is 21221001120899. The next prime is 21221001121037. The reversal of 21221001121036 is 63012110012212.

It is a super-2 number, since 2×21221001121036² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221001120998 and 21221001121016.

It is not an unprimeable number, because it can be changed into a prime (21221001121037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3405163945 + ... + 3405170176.

It is an arithmetic number, because the mean of its divisors is an integer number (1668531859890).

Almost surely, 2^{21221001121036} is an apocalyptic number.

It is an amenable number.

21221001121036 is a deficient number, since it is larger than the sum of its proper divisors (18823763516324).

21221001121036 is a wasteful number, since it uses less digits than its factorization.

21221001121036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810334185 (or 6810334183 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21221001121036 its reverse (63012110012212), we get a palindrome (84233111133248).

The spelling of 21221001121036 in words is "twenty-one trillion, two hundred twenty-one billion, one million, one hundred twenty-one thousand, thirty-six".