21150012154315 has 16 divisors (see below), whose sum is σ = 27693786783456. Its totient is φ = 15378216940800.

The previous prime is 21150012154307. The next prime is 21150012154319. The reversal of 21150012154315 is 51345121005112.

It is not a de Polignac number, because 21150012154315 - 2³ = 21150012154307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21150012154319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44889522 + ... + 45358231.

It is an arithmetic number, because the mean of its divisors is an integer number (1730861673966).

Almost surely, 2^{21150012154315} is an apocalyptic number.

21150012154315 is a deficient number, since it is larger than the sum of its proper divisors (6543774629141).

21150012154315 is a wasteful number, since it uses less digits than its factorization.

21150012154315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90252030.

The product of its (nonzero) digits is 6000, while the sum is 31.

Adding to 21150012154315 its reverse (51345121005112), we get a palindrome (72495133159427).

The spelling of 21150012154315 in words is "twenty-one trillion, one hundred fifty billion, twelve million, one hundred fifty-four thousand, three hundred fifteen".