221210404012101 has 16 divisors (see below), whose sum is σ = 344254488920064. Its totient is φ = 123716456954544.

The previous prime is 221210404012093. The next prime is 221210404012121. The reversal of 221210404012101 is 101210404012122.

It is not a de Polignac number, because 221210404012101 - 2³ = 221210404012093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210404012121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112062007125 + ... + 112062009098.

It is an arithmetic number, because the mean of its divisors is an integer number (21515905557504).

Almost surely, 2^{221210404012101} is an apocalyptic number.

221210404012101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221210404012101 is a deficient number, since it is larger than the sum of its proper divisors (123044084907963).

221210404012101 is a wasteful number, since it uses less digits than its factorization.

221210404012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224124016280.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221210404012101 its sum of digits (21), we get a palindrome (221210404012122).

Adding to 221210404012101 its reverse (101210404012122), we get a palindrome (322420808024223).

The spelling of 221210404012101 in words is "two hundred twenty-one trillion, two hundred ten billion, four hundred four million, twelve thousand, one hundred one".