21221221212022 has 24 divisors (see below), whose sum is σ = 34871306593536. Its totient is φ = 9628402803504.

The previous prime is 21221221212007. The next prime is 21221221212053. The reversal of 21221221212022 is 22021212212212.

It is a junction number, because it is equal to n+sod(n) for n = 21221221211984 and 21221221212002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117146038 + ... + 117327049.

It is an arithmetic number, because the mean of its divisors is an integer number (1452971108064).

Almost surely, 2^{21221221212022} is an apocalyptic number.

21221221212022 is a deficient number, since it is larger than the sum of its proper divisors (13650085381514).

21221221212022 is a wasteful number, since it uses less digits than its factorization.

21221221212022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234473220 (or 234473161 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21221221212022 its reverse (22021212212212), we get a palindrome (43242433424234).

The spelling of 21221221212022 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, twenty-two".