101011111221 has 16 divisors (see below), whose sum is σ = 138332346048. Its totient is φ = 65515593600.

The previous prime is 101011111217. The next prime is 101011111231. The reversal of 101011111221 is 122111110101.

It is not a de Polignac number, because 101011111221 - 2² = 101011111217 is a prime.

It is a super-2 number, since 2×101011111221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 101011111197 and 101011111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101011111211) 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, 1825441 + ... + 1879961.

It is an arithmetic number, because the mean of its divisors is an integer number (8645771628).

Almost surely, 2^101011111221 is an apocalyptic number.

It is an amenable number.

101011111221 is a deficient number, since it is larger than the sum of its proper divisors (37321234827).

101011111221 is a wasteful number, since it uses less digits than its factorization.

101011111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71252.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 101011111221 its reverse (122111110101), we get a palindrome (223122221322).

The spelling of 101011111221 in words is "one hundred one billion, eleven million, one hundred eleven thousand, two hundred twenty-one".