10101220111221 has 16 divisors (see below), whose sum is σ = 13479178518528. Its totient is φ = 6728706270000.

The previous prime is 10101220111123. The next prime is 10101220111223. The reversal of 10101220111221 is 12211102210101.

It is a happy number.

It is not a de Polignac number, because 10101220111221 - 2¹⁴ = 10101220094837 is a prime.

It is a super-2 number, since 2×10101220111221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10101220111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101220111223) 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, 19687896 + ... + 20194446.

It is an arithmetic number, because the mean of its divisors is an integer number (842448657408).

Almost surely, 2^{10101220111221} is an apocalyptic number.

It is an amenable number.

10101220111221 is a deficient number, since it is larger than the sum of its proper divisors (3377958407307).

10101220111221 is a wasteful number, since it uses less digits than its factorization.

10101220111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511912.

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

Adding to 10101220111221 its reverse (12211102210101), we get a palindrome (22312322321322).

The spelling of 10101220111221 in words is "ten trillion, one hundred one billion, two hundred twenty million, one hundred eleven thousand, two hundred twenty-one".