1021121011 has 4 divisors (see below), whose sum is σ = 1021354272. Its totient is φ = 1020887752.

The previous prime is 1021120987. The next prime is 1021121033. The reversal of 1021121011 is 1101211201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1101211201 = 3359 ⋅327839.

It is a cyclic number.

It is not a de Polignac number, because 1021121011 - 2⁵ = 1021120979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021121051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109936 + ... + 118861.

It is an arithmetic number, because the mean of its divisors is an integer number (255338568).

Almost surely, 2^1021121011 is an apocalyptic number.

1021121011 is a deficient number, since it is larger than the sum of its proper divisors (233261).

1021121011 is an equidigital number, since it uses as much as digits as its factorization.

1021121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233260.

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

The square root of 1021121011 is about 31954.9841339344. The cubic root of 1021121011 is about 1006.9913441966.

Adding to 1021121011 its reverse (1101211201), we get a palindrome (2122332212).

The spelling of 1021121011 in words is "one billion, twenty-one million, one hundred twenty-one thousand, eleven".