21870317415 has 8 divisors (see below), whose sum is σ = 34992507888. Its totient is φ = 11664169280.

The previous prime is 21870317401. The next prime is 21870317429. The reversal of 21870317415 is 51471307812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21870317401) and next prime (21870317429).

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

It is not a de Polignac number, because 21870317415 - 2⁶ = 21870317351 is a prime.

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, 729010566 + ... + 729010595.

It is an arithmetic number, because the mean of its divisors is an integer number (4374063486).

Almost surely, 2^21870317415 is an apocalyptic number.

21870317415 is a deficient number, since it is larger than the sum of its proper divisors (13122190473).

21870317415 is a wasteful number, since it uses less digits than its factorization.

21870317415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458021169.

The product of its (nonzero) digits is 47040, while the sum is 39.

The spelling of 21870317415 in words is "twenty-one billion, eight hundred seventy million, three hundred seventeen thousand, four hundred fifteen".