1101120021 has 32 divisors (see below), whose sum is σ = 1646161920. Its totient is φ = 727425792.

The previous prime is 1101120019. The next prime is 1101120029. The reversal of 1101120021 is 1200211011.

It is a happy number.

It is not a de Polignac number, because 1101120021 - 2¹ = 1101120019 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 = 1101119985 and 1101120012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101120029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2409225 + ... + 2409681.

It is an arithmetic number, because the mean of its divisors is an integer number (51442560).

Almost surely, 2^1101120021 is an apocalyptic number.

It is an amenable number.

1101120021 is a deficient number, since it is larger than the sum of its proper divisors (545041899).

1101120021 is a wasteful number, since it uses less digits than its factorization.

1101120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082 (or 1076 counting only the distinct ones).

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

The square root of 1101120021 is about 33183.1285595557. The cubic root of 1101120021 is about 1032.6303527966.

Adding to 1101120021 its reverse (1200211011), we get a palindrome (2301331032).

The spelling of 1101120021 in words is "one billion, one hundred one million, one hundred twenty thousand, twenty-one".