21030545015042 has 8 divisors (see below), whose sum is σ = 31548450545532. Its totient is φ = 10514394833200.

The previous prime is 21030545015033. The next prime is 21030545015047. The reversal of 21030545015042 is 24051054503012.

It can be written as a sum of positive squares in 2 ways, for example, as 13495843921561 + 7534701093481 = 3673669^2 + 2744941^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21030545015047) 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, 438807209 + ... + 438855132.

Almost surely, 2^{21030545015042} is an apocalyptic number.

21030545015042 is a deficient number, since it is larger than the sum of its proper divisors (10517905530490).

21030545015042 is a wasteful number, since it uses less digits than its factorization.

21030545015042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877674324.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21030545015042 its reverse (24051054503012), we get a palindrome (45081599518054).

The spelling of 21030545015042 in words is "twenty-one trillion, thirty billion, five hundred forty-five million, fifteen thousand, forty-two".