1973143021 has 12 divisors (see below), whose sum is σ = 2110655008. Its totient is φ = 1843440984.

The previous prime is 1973143019. The next prime is 1973143043. The reversal of 1973143021 is 1203413791.

It is not a de Polignac number, because 1973143021 - 2¹ = 1973143019 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 (1973143001) 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, 20625 + ... + 66118.

Almost surely, 2^1973143021 is an apocalyptic number.

It is an amenable number.

1973143021 is a deficient number, since it is larger than the sum of its proper divisors (137511987).

1973143021 is an equidigital number, since it uses as much as digits as its factorization.

1973143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86832 (or 86809 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1973143021 is about 44420.0745271775. The cubic root of 1973143021 is about 1254.2560038455.

The spelling of 1973143021 in words is "one billion, nine hundred seventy-three million, one hundred forty-three thousand, twenty-one".