221210100110021 has 16 divisors (see below), whose sum is σ = 241931350203840. Its totient is φ = 200590737684480.

The previous prime is 221210100109997. The next prime is 221210100110023. The reversal of 221210100110021 is 120011001012122.

It is a de Polignac number, because none of the positive numbers 2^k-221210100110021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221210100109978 and 221210100110005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210100110023) 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, 352308485 + ... + 352935813.

It is an arithmetic number, because the mean of its divisors is an integer number (15120709387740).

Almost surely, 2^{221210100110021} is an apocalyptic number.

It is an amenable number.

221210100110021 is a deficient number, since it is larger than the sum of its proper divisors (20721250093819).

221210100110021 is a wasteful number, since it uses less digits than its factorization.

221210100110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708484.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221210100110021 its reverse (120011001012122), we get a palindrome (341221101122143).

The spelling of 221210100110021 in words is "two hundred twenty-one trillion, two hundred ten billion, one hundred million, one hundred ten thousand, twenty-one".