21152206400315 has 8 divisors (see below), whose sum is σ = 25402068229680. Its totient is φ = 16908818087392.

The previous prime is 21152206400243. The next prime is 21152206400341. The reversal of 21152206400315 is 51300460225112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21152206400315 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1618371920 + ... + 1618384989.

It is an arithmetic number, because the mean of its divisors is an integer number (3175258528710).

Almost surely, 2^{21152206400315} is an apocalyptic number.

21152206400315 is a deficient number, since it is larger than the sum of its proper divisors (4249861829365).

21152206400315 is a wasteful number, since it uses less digits than its factorization.

21152206400315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3236758221.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21152206400315 its reverse (51300460225112), we get a palindrome (72452666625427).

The spelling of 21152206400315 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred six million, four hundred thousand, three hundred fifteen".