221012212011101 has 6 divisors (see below), whose sum is σ = 257095838461950. Its totient is φ = 189439038866616.

The previous prime is 221012212011083. The next prime is 221012212011113. The reversal of 221012212011101 is 101110212210122.

It can be written as a sum of positive squares in only one way, i.e., 208402397950201 + 12609814060900 = 14436149^2 + 3551030^2 .

It is not a de Polignac number, because 221012212011101 - 2¹⁰ = 221012212010077 is a prime.

It is a super-5 number, since 5×221012212011101⁵ (a number of 73 digits) contains 55555 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221012212011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012212011131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2255226653126 + ... + 2255226653223.

It is an arithmetic number, because the mean of its divisors is an integer number (42849306410325).

Almost surely, 2^{221012212011101} is an apocalyptic number.

It is an amenable number.

221012212011101 is a deficient number, since it is larger than the sum of its proper divisors (36083626450849).

221012212011101 is an equidigital number, since it uses as much as digits as its factorization.

221012212011101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510453306363 (or 4510453306356 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221012212011101 its reverse (101110212210122), we get a palindrome (322122424221223).

The spelling of 221012212011101 in words is "two hundred twenty-one trillion, twelve billion, two hundred twelve million, eleven thousand, one hundred one".