10402121111 has 4 divisors (see below), whose sum is σ = 10655831424. Its totient is φ = 10148410800.

The previous prime is 10402121089. The next prime is 10402121117. The reversal of 10402121111 is 11112120401.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10402121111 - 2³⁰ = 9328379287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10402121117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126855095 + ... + 126855176.

It is an arithmetic number, because the mean of its divisors is an integer number (2663957856).

Almost surely, 2^10402121111 is an apocalyptic number.

10402121111 is a deficient number, since it is larger than the sum of its proper divisors (253710313).

10402121111 is an equidigital number, since it uses as much as digits as its factorization.

10402121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253710312.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 10402121111 its reverse (11112120401), we get a palindrome (21514241512).

The spelling of 10402121111 in words is "ten billion, four hundred two million, one hundred twenty-one thousand, one hundred eleven".