21210131015 has 8 divisors (see below), whose sum is σ = 26791744560. Its totient is φ = 16075046592.

The previous prime is 21210130927. The next prime is 21210131051. The reversal of 21210131015 is 51013101212.

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 21210131015 - 2²⁶ = 21143022151 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210130984 and 21210131002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111632174 + ... + 111632363.

It is an arithmetic number, because the mean of its divisors is an integer number (3348968070).

Almost surely, 2^21210131015 is an apocalyptic number.

21210131015 is a deficient number, since it is larger than the sum of its proper divisors (5581613545).

21210131015 is a wasteful number, since it uses less digits than its factorization.

21210131015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223264561.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 21210131015 its reverse (51013101212), we get a palindrome (72223232227).

The spelling of 21210131015 in words is "twenty-one billion, two hundred ten million, one hundred thirty-one thousand, fifteen".