215123410454 has 16 divisors (see below), whose sum is σ = 341676808848. Its totient is φ = 101231519232.

The previous prime is 215123410451. The next prime is 215123410501. The reversal of 215123410454 is 454014321512.

215123410454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215123410454² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215123410454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215123410451) by changing a digit.

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, 1402814 + ... + 1548590.

It is an arithmetic number, because the mean of its divisors is an integer number (21354800553).

Almost surely, 2^215123410454 is an apocalyptic number.

215123410454 is a deficient number, since it is larger than the sum of its proper divisors (126553398394).

215123410454 is a wasteful number, since it uses less digits than its factorization.

215123410454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189199.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 215123410454 its reverse (454014321512), we get a palindrome (669137731966).

The spelling of 215123410454 in words is "two hundred fifteen billion, one hundred twenty-three million, four hundred ten thousand, four hundred fifty-four".