111002000001021 has 40 divisors (see below), whose sum is σ = 171540834874200. Its totient is φ = 71447406791040.

The previous prime is 111002000000999. The next prime is 111002000001023. The reversal of 111002000001021 is 120100000200111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 37478749316121 + 73523250684900 = 6121989^2 + 8574570^2 .

It is not a de Polignac number, because 111002000001021 - 2³¹ = 110999852517373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 111002000000994 and 111002000001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111002000001023) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 79031275 + ... + 80423543.

It is an arithmetic number, because the mean of its divisors is an integer number (4288520871855).

Almost surely, 2^{111002000001021} is an apocalyptic number.

It is an amenable number.

111002000001021 is a deficient number, since it is larger than the sum of its proper divisors (60538834873179).

111002000001021 is a wasteful number, since it uses less digits than its factorization.

111002000001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426251 (or 1426242 counting only the distinct ones).

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

Adding to 111002000001021 its reverse (120100000200111), we get a palindrome (231102000201132).

The spelling of 111002000001021 in words is "one hundred eleven trillion, two billion, one thousand, twenty-one".