11111010021 has 12 divisors (see below), whose sum is σ = 16069639872. Its totient is φ = 7397923176.

The previous prime is 11111009969. The next prime is 11111010037. The reversal of 11111010021 is 12001011111.

It is not a de Polignac number, because 11111010021 - 2⁹ = 11111009509 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 = 11111009985 and 11111010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111010061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 777261 + ... + 791426.

It is an arithmetic number, because the mean of its divisors is an integer number (1339136656).

Almost surely, 2^11111010021 is an apocalyptic number.

It is an amenable number.

11111010021 is a deficient number, since it is larger than the sum of its proper divisors (4958629851).

11111010021 is a wasteful number, since it uses less digits than its factorization.

11111010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569480 (or 1569477 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 11111010021 its reverse (12001011111), we get a palindrome (23112021132).

The spelling of 11111010021 in words is "eleven billion, one hundred eleven million, ten thousand, twenty-one".