21300122015 has 8 divisors (see below), whose sum is σ = 25786343088. Its totient is φ = 16889299840.

The previous prime is 21300121987. The next prime is 21300122021. The reversal of 21300122015 is 51022100312.

It is a happy number.

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

It is not a de Polignac number, because 21300122015 - 2⁶ = 21300121951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21300121984 and 21300122002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18849101 + ... + 18850230.

It is an arithmetic number, because the mean of its divisors is an integer number (3223292886).

Almost surely, 2^21300122015 is an apocalyptic number.

21300122015 is a deficient number, since it is larger than the sum of its proper divisors (4486221073).

21300122015 is a wasteful number, since it uses less digits than its factorization.

21300122015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37699449.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21300122015 its reverse (51022100312), we get a palindrome (72322222327).

The spelling of 21300122015 in words is "twenty-one billion, three hundred million, one hundred twenty-two thousand, fifteen".