21123301242215 has 16 divisors (see below), whose sum is σ = 27704792828160. Its totient is φ = 15391551567360.

The previous prime is 21123301242163. The next prime is 21123301242217. The reversal of 21123301242215 is 51224210332112.

It is not a de Polignac number, because 21123301242215 - 2¹⁰ = 21123301241191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123301242217) 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, 4008213920 + ... + 4008219189.

It is an arithmetic number, because the mean of its divisors is an integer number (1731549551760).

Almost surely, 2^{21123301242215} is an apocalyptic number.

21123301242215 is a deficient number, since it is larger than the sum of its proper divisors (6581491585945).

21123301242215 is a wasteful number, since it uses less digits than its factorization.

21123301242215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8016433162.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21123301242215 its reverse (51224210332112), we get a palindrome (72347511574327).

The spelling of 21123301242215 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred one million, two hundred forty-two thousand, two hundred fifteen".