1540503540021 has 8 divisors (see below), whose sum is σ = 2054540609280. Its totient is φ = 1026734415392.

The previous prime is 1540503540001. The next prime is 1540503540029. The reversal of 1540503540021 is 1200453050451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1540503540021 - 2¹⁷ = 1540503408949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540503540029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66972741 + ... + 66995738.

It is an arithmetic number, because the mean of its divisors is an integer number (256817576160).

Almost surely, 2^{1540503540021} is an apocalyptic number.

It is an amenable number.

1540503540021 is a deficient number, since it is larger than the sum of its proper divisors (514037069259).

1540503540021 is a wasteful number, since it uses less digits than its factorization.

1540503540021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133972315.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 1540503540021 its reverse (1200453050451), we get a palindrome (2740956590472).

The spelling of 1540503540021 in words is "one trillion, five hundred forty billion, five hundred three million, five hundred forty thousand, twenty-one".