1021205103 has 24 divisors (see below), whose sum is σ = 1456840368. Its totient is φ = 636087168.

The previous prime is 1021205071. The next prime is 1021205117. The reversal of 1021205103 is 3015021201.

It is not a de Polignac number, because 1021205103 - 2⁵ = 1021205071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021204103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72601 + ... + 85517.

It is an arithmetic number, because the mean of its divisors is an integer number (60701682).

Almost surely, 2^1021205103 is an apocalyptic number.

1021205103 is a deficient number, since it is larger than the sum of its proper divisors (435635265).

1021205103 is a wasteful number, since it uses less digits than its factorization.

1021205103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13031 (or 13012 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1021205103 is about 31956.2998953258. The cubic root of 1021205103 is about 1007.0189862327.

Adding to 1021205103 its reverse (3015021201), we get a palindrome (4036226304).

The spelling of 1021205103 in words is "one billion, twenty-one million, two hundred five thousand, one hundred three".