101221201110021 has 16 divisors (see below), whose sum is σ = 136784329830720. Its totient is φ = 66574750642560.

The previous prime is 101221201109933. The next prime is 101221201110097. The reversal of 101221201110021 is 120011102122101.

It is a happy number.

It is not a de Polignac number, because 101221201110021 - 2³⁴ = 101204021240837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221201110221) 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, 664183375 + ... + 664335756.

It is an arithmetic number, because the mean of its divisors is an integer number (8549020614420).

Almost surely, 2^{101221201110021} is an apocalyptic number.

It is an amenable number.

101221201110021 is a deficient number, since it is larger than the sum of its proper divisors (35563128720699).

101221201110021 is a wasteful number, since it uses less digits than its factorization.

101221201110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328519476.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 101221201110021 its reverse (120011102122101), we get a palindrome (221232303232122).

The spelling of 101221201110021 in words is "one hundred one trillion, two hundred twenty-one billion, two hundred one million, one hundred ten thousand, twenty-one".