1021603971 has 4 divisors (see below), whose sum is σ = 1362138632. Its totient is φ = 681069312.

The previous prime is 1021603969. The next prime is 1021603981. The reversal of 1021603971 is 1793061201.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1021603971 - 2¹ = 1021603969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021603981) 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, 170267326 + ... + 170267331.

It is an arithmetic number, because the mean of its divisors is an integer number (340534658).

Almost surely, 2^1021603971 is an apocalyptic number.

1021603971 is a deficient number, since it is larger than the sum of its proper divisors (340534661).

1021603971 is an equidigital number, since it uses as much as digits as its factorization.

1021603971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340534660.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1021603971 is about 31962.5401212106. The cubic root of 1021603971 is about 1007.1500782024.

The spelling of 1021603971 in words is "one billion, twenty-one million, six hundred three thousand, nine hundred seventy-one".