21015240014 has 4 divisors (see below), whose sum is σ = 31522860024. Its totient is φ = 10507620006.

The previous prime is 21015239969. The next prime is 21015240041. The reversal of 21015240014 is 41004251012.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253810002 + ... + 5253810005.

It is an arithmetic number, because the mean of its divisors is an integer number (7880715006).

Almost surely, 2^21015240014 is an apocalyptic number.

21015240014 is a deficient number, since it is larger than the sum of its proper divisors (10507620010).

21015240014 is a wasteful number, since it uses less digits than its factorization.

21015240014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10507620009.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21015240014 its reverse (41004251012), we get a palindrome (62019491026).

The spelling of 21015240014 in words is "twenty-one billion, fifteen million, two hundred forty thousand, fourteen".