1021103405 has 24 divisors (see below), whose sum is σ = 1431011448. Its totient is φ = 697417728.

The previous prime is 1021103399. The next prime is 1021103437. The reversal of 1021103405 is 5043011201.

It can be written as a sum of positive squares in 4 ways, for example, as 540748516 + 480354889 = 23254^2 + 21917^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1021103405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54857 + ... + 71073.

It is an arithmetic number, because the mean of its divisors is an integer number (59625477).

Almost surely, 2^1021103405 is an apocalyptic number.

It is an amenable number.

1021103405 is a deficient number, since it is larger than the sum of its proper divisors (409908043).

1021103405 is a wasteful number, since it uses less digits than its factorization.

1021103405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16493 (or 16486 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1021103405 is about 31954.7086514648. The cubic root of 1021103405 is about 1006.9855567038.

Adding to 1021103405 its reverse (5043011201), we get a palindrome (6064114606).

The spelling of 1021103405 in words is "one billion, twenty-one million, one hundred three thousand, four hundred five".