221102021120021 has 16 divisors (see below), whose sum is σ = 222574138766400. Its totient is φ = 219630722762880.

The previous prime is 221102021120003. The next prime is 221102021120053. The reversal of 221102021120021 is 120021120201122.

It is a cyclic number.

It is not a de Polignac number, because 221102021120021 - 2⁶ = 221102021119957 is a prime.

It is a super-2 number, since 2×221102021120021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102021120221) 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, 11381161910 + ... + 11381181336.

It is an arithmetic number, because the mean of its divisors is an integer number (13910883672900).

Almost surely, 2^{221102021120021} is an apocalyptic number.

It is an amenable number.

221102021120021 is a deficient number, since it is larger than the sum of its proper divisors (1472117646379).

221102021120021 is a wasteful number, since it uses less digits than its factorization.

221102021120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36644.

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

Adding to 221102021120021 its reverse (120021120201122), we get a palindrome (341123141321143).

The spelling of 221102021120021 in words is "two hundred twenty-one trillion, one hundred two billion, twenty-one million, one hundred twenty thousand, twenty-one".