21221201212063 has 16 divisors (see below), whose sum is σ = 21484403740800. Its totient is φ = 20959829811360.

The previous prime is 21221201212061. The next prime is 21221201212109. The reversal of 21221201212063 is 36021210212212.

It is a cyclic number.

It is not a de Polignac number, because 21221201212063 - 2¹ = 21221201212061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221201212061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22798848 + ... + 23711386.

It is an arithmetic number, because the mean of its divisors is an integer number (1342775233800).

Almost surely, 2^{21221201212063} is an apocalyptic number.

21221201212063 is a deficient number, since it is larger than the sum of its proper divisors (263202528737).

21221201212063 is a wasteful number, since it uses less digits than its factorization.

21221201212063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913542.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 21221201212063 its reverse (36021210212212), we get a palindrome (57242411424275).

The spelling of 21221201212063 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, sixty-three".