1021100139 has 6 divisors (see below), whose sum is σ = 1474922436. Its totient is φ = 680733420.

The previous prime is 1021100099. The next prime is 1021100141. The reversal of 1021100139 is 9310011201.

It is not a de Polignac number, because 1021100139 - 2⁷ = 1021100011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021100539) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56727777 + ... + 56727794.

It is an arithmetic number, because the mean of its divisors is an integer number (245820406).

Almost surely, 2^1021100139 is an apocalyptic number.

1021100139 is a deficient number, since it is larger than the sum of its proper divisors (453822297).

1021100139 is a wasteful number, since it uses less digits than its factorization.

1021100139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113455577 (or 113455574 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 1021100139 is about 31954.6575478443. The cubic root of 1021100139 is about 1006.9844830880.

The spelling of 1021100139 in words is "one billion, twenty-one million, one hundred thousand, one hundred thirty-nine".