111020021001 has 6 divisors (see below), whose sum is σ = 160362252570. Its totient is φ = 74013347328.

The previous prime is 111020020997. The next prime is 111020021039. The reversal of 111020021001 is 100120020111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 73916015625 + 37104005376 = 271875^2 + 192624^2 .

It is not a de Polignac number, because 111020021001 - 2² = 111020020997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 12335557889 = 111020021001 / (1 + 1 + 1 + 0 + 2 + 0 + 0 + 2 + 1 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (111020021071) 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, 6167778936 + ... + 6167778953.

It is an arithmetic number, because the mean of its divisors is an integer number (26727042095).

Almost surely, 2^111020021001 is an apocalyptic number.

It is an amenable number.

111020021001 is a deficient number, since it is larger than the sum of its proper divisors (49342231569).

111020021001 is a wasteful number, since it uses less digits than its factorization.

111020021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12335557895 (or 12335557892 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 111020021001 its reverse (100120020111), we get a palindrome (211140041112).

The spelling of 111020021001 in words is "one hundred eleven billion, twenty million, twenty-one thousand, one".