1121010021 has 12 divisors (see below), whose sum is σ = 1619811648. Its totient is φ = 747074664.

The previous prime is 1121009999. The next prime is 1121010061. The reversal of 1121010021 is 1200101211.

It is a happy number.

It is not a de Polignac number, because 1121010021 - 2⁹ = 1121009509 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 = 1121009985 and 1121010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121010061) 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, 6606 + ... + 47808.

It is an arithmetic number, because the mean of its divisors is an integer number (134984304).

Almost surely, 2^1121010021 is an apocalyptic number.

It is an amenable number.

1121010021 is a deficient number, since it is larger than the sum of its proper divisors (498801627).

1121010021 is a wasteful number, since it uses less digits than its factorization.

1121010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44232 (or 44229 counting only the distinct ones).

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

The square root of 1121010021 is about 33481.4877357623. The cubic root of 1121010021 is about 1038.8109008679.

Adding to 1121010021 its reverse (1200101211), we get a palindrome (2321111232).

The spelling of 1121010021 in words is "one billion, one hundred twenty-one million, ten thousand, twenty-one".