1101121021 has 64 divisors (see below), whose sum is σ = 1557319680. Its totient is φ = 754902720.

The previous prime is 1101121009. The next prime is 1101121033. The reversal of 1101121021 is 1201211011.

It is an interprime number because it is at equal distance from previous prime (1101121009) and next prime (1101121033).

It is not a de Polignac number, because 1101121021 - 2¹⁵ = 1101088253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101120989 and 1101121007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101121061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3890746 + ... + 3891028.

It is an arithmetic number, because the mean of its divisors is an integer number (24333120).

Almost surely, 2^1101121021 is an apocalyptic number.

1101121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1101121021 is a deficient number, since it is larger than the sum of its proper divisors (456198659).

1101121021 is a wasteful number, since it uses less digits than its factorization.

1101121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1101121021 is about 33183.1436274504. The cubic root of 1101121021 is about 1032.6306653965.

Adding to 1101121021 its reverse (1201211011), we get a palindrome (2302332032).

The spelling of 1101121021 in words is "one billion, one hundred one million, one hundred twenty-one thousand, twenty-one".