11100021012 has 36 divisors (see below), whose sum is σ = 28072175040. Its totient is φ = 3698188752.

The previous prime is 11100021011. The next prime is 11100021013. The reversal of 11100021012 is 21012000111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11100021011) and next prime (11100021013).

It is a tau number, because it is divible by the number of its divisors (36).

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 = 11100020985 and 11100021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100021011) 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, 462 + ... + 148997.

It is an arithmetic number, because the mean of its divisors is an integer number (779782640).

Almost surely, 2^11100021012 is an apocalyptic number.

11100021012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11100021012 is an abundant number, since it is smaller than the sum of its proper divisors (16972154028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11100021012 is a wasteful number, since it uses less digits than its factorization.

11100021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151532 (or 151527 counting only the distinct ones).

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

Adding to 11100021012 its reverse (21012000111), we get a palindrome (32112021123).

The spelling of 11100021012 in words is "eleven billion, one hundred million, twenty-one thousand, twelve".