21150011262215 has 24 divisors (see below), whose sum is σ = 29221209241488. Its totient is φ = 14572256549760.

The previous prime is 21150011262209. The next prime is 21150011262217. The reversal of 21150011262215 is 51226211005112.

It is not a de Polignac number, because 21150011262215 - 2⁴ = 21150011262199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150011262217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 532591862 + ... + 532631571.

It is an arithmetic number, because the mean of its divisors is an integer number (1217550385062).

Almost surely, 2^{21150011262215} is an apocalyptic number.

21150011262215 is a deficient number, since it is larger than the sum of its proper divisors (8071197979273).

21150011262215 is a wasteful number, since it uses less digits than its factorization.

21150011262215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065223487 (or 1065223468 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 29.

Adding to 21150011262215 its reverse (51226211005112), we get a palindrome (72376222267327).

The spelling of 21150011262215 in words is "twenty-one trillion, one hundred fifty billion, eleven million, two hundred sixty-two thousand, two hundred fifteen".