15315420243021 has 8 divisors (see below), whose sum is σ = 21079288076544. Its totient is φ = 9880916285760.

The previous prime is 15315420243007. The next prime is 15315420243029. The reversal of 15315420243021 is 12034202451351.

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

It is not a de Polignac number, because 15315420243021 - 2⁹ = 15315420242509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15315420243029) 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, 82340968956 + ... + 82340969141.

It is an arithmetic number, because the mean of its divisors is an integer number (2634911009568).

Almost surely, 2^{15315420243021} is an apocalyptic number.

It is an amenable number.

15315420243021 is a deficient number, since it is larger than the sum of its proper divisors (5763867833523).

15315420243021 is a wasteful number, since it uses less digits than its factorization.

15315420243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164681938131.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 15315420243021 its reverse (12034202451351), we get a palindrome (27349622694372).

The spelling of 15315420243021 in words is "fifteen trillion, three hundred fifteen billion, four hundred twenty million, two hundred forty-three thousand, twenty-one".