1545051542021 has 4 divisors (see below), whose sum is σ = 1663901660652. Its totient is φ = 1426201423392.

The previous prime is 1545051542017. The next prime is 1545051542039. The reversal of 1545051542021 is 1202451505451.

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

It can be written as a sum of positive squares in 2 ways, for example, as 589691911396 + 955359630625 = 767914^2 + 977425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545051542021 - 2² = 1545051542017 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 (1545051542071) 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, 59425059296 + ... + 59425059321.

It is an arithmetic number, because the mean of its divisors is an integer number (415975415163).

Almost surely, 2^{1545051542021} is an apocalyptic number.

It is an amenable number.

1545051542021 is a deficient number, since it is larger than the sum of its proper divisors (118850118631).

1545051542021 is a wasteful number, since it uses less digits than its factorization.

1545051542021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118850118630.

The product of its (nonzero) digits is 40000, while the sum is 35.

The spelling of 1545051542021 in words is "one trillion, five hundred forty-five billion, fifty-one million, five hundred forty-two thousand, twenty-one".