1002110121 has 6 divisors (see below), whose sum is σ = 1447492410. Its totient is φ = 668073408.

The previous prime is 1002110111. The next prime is 1002110143. The reversal of 1002110121 is 1210112001.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 757625625 + 244484496 = 27525^2 + 15636^2 .

It is not a de Polignac number, because 1002110121 - 2¹⁵ = 1002077353 is a prime.

It is a super-2 number, since 2×1002110121² = 2008449389221269282, which contains 22 as substring.

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: 111345569 = 1002110121 / (1 + 0 + 0 + 2 + 1 + 1 + 0 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (1002110111) 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, 55672776 + ... + 55672793.

It is an arithmetic number, because the mean of its divisors is an integer number (241248735).

Almost surely, 2^1002110121 is an apocalyptic number.

It is an amenable number.

1002110121 is a deficient number, since it is larger than the sum of its proper divisors (445382289).

1002110121 is a wasteful number, since it uses less digits than its factorization.

1002110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111345575 (or 111345572 counting only the distinct ones).

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

The square root of 1002110121 is about 31656.1229622328. The cubic root of 1002110121 is about 1000.7028795113.

Adding to 1002110121 its reverse (1210112001), we get a palindrome (2212222122).

The spelling of 1002110121 in words is "one billion, two million, one hundred ten thousand, one hundred twenty-one".