1011980921 has 16 divisors (see below), whose sum is σ = 1188324480. Its totient is φ = 843886080.

The previous prime is 1011980909. The next prime is 1011980927. The reversal of 1011980921 is 1290891101.

It is a cyclic number.

It is not a de Polignac number, because 1011980921 - 2¹⁸ = 1011718777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011980927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27431 + ... + 52691.

It is an arithmetic number, because the mean of its divisors is an integer number (74270280).

Almost surely, 2^1011980921 is an apocalyptic number.

It is an amenable number.

1011980921 is a deficient number, since it is larger than the sum of its proper divisors (176343559).

1011980921 is an equidigital number, since it uses as much as digits as its factorization.

1011980921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25424.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 1011980921 is about 31811.6475681471. The cubic root of 1011980921 is about 1003.9777964884.

The spelling of 1011980921 in words is "one billion, eleven million, nine hundred eighty thousand, nine hundred twenty-one".