1573138021 has 12 divisors (see below), whose sum is σ = 1946809632. Its totient is φ = 1244679696.

The previous prime is 1573138019. The next prime is 1573138037. The reversal of 1573138021 is 1208313751.

It is not a de Polignac number, because 1573138021 - 2¹ = 1573138019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1573138001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 663711 + ... + 666076.

It is an arithmetic number, because the mean of its divisors is an integer number (162234136).

Almost surely, 2^1573138021 is an apocalyptic number.

It is an amenable number.

1573138021 is a deficient number, since it is larger than the sum of its proper divisors (373671611).

1573138021 is a wasteful number, since it uses less digits than its factorization.

1573138021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329820 (or 1329807 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1573138021 is about 39662.8039982047. The cubic root of 1573138021 is about 1163.0247114613.

The spelling of 1573138021 in words is "one billion, five hundred seventy-three million, one hundred thirty-eight thousand, twenty-one".