10111001021 has 32 divisors (see below), whose sum is σ = 11584895616. Its totient is φ = 8743680000.

The previous prime is 10111001011. The next prime is 10111001053. The reversal of 10111001021 is 12010011101.

It is a happy number.

It is not a de Polignac number, because 10111001021 - 2⁶ = 10111000957 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 (10111001011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3050261 + ... + 3053573.

It is an arithmetic number, because the mean of its divisors is an integer number (362027988).

Almost surely, 2^10111001021 is an apocalyptic number.

10111001021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10111001021 is a deficient number, since it is larger than the sum of its proper divisors (1473894595).

10111001021 is a wasteful number, since it uses less digits than its factorization.

10111001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3533.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 10111001021 its reverse (12010011101), we get a palindrome (22121012122).

The spelling of 10111001021 in words is "ten billion, one hundred eleven million, one thousand, twenty-one".