1100021129 has 2 divisors, whose sum is σ = 1100021130. Its totient is φ = 1100021128.

The previous prime is 1100021107. The next prime is 1100021149. The reversal of 1100021129 is 9211200011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665382025 + 434639104 = 25795^2 + 20848^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100021129 - 2¹² = 1100017033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1100021149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550010564 + 550010565.

It is an arithmetic number, because the mean of its divisors is an integer number (550010565).

Almost surely, 2^1100021129 is an apocalyptic number.

It is an amenable number.

1100021129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100021129 is an equidigital number, since it uses as much as digits as its factorization.

1100021129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1100021129 is about 33166.5664336844. The cubic root of 1100021129 is about 1032.2867248221.

The spelling of 1100021129 in words is "one billion, one hundred million, twenty-one thousand, one hundred twenty-nine".