21523150454 has 32 divisors (see below), whose sum is σ = 35122508064. Its totient is φ = 9832757760.

The previous prime is 21523150409. The next prime is 21523150457. The reversal of 21523150454 is 45405132512.

It is a super-2 number, since 2×21523150454² (a number of 21 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 21523150454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523150457) 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, 2407637 + ... + 2416559.

It is an arithmetic number, because the mean of its divisors is an integer number (1097578377).

Almost surely, 2^21523150454 is an apocalyptic number.

21523150454 is a deficient number, since it is larger than the sum of its proper divisors (13599357610).

21523150454 is a wasteful number, since it uses less digits than its factorization.

21523150454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9872.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21523150454 its reverse (45405132512), we get a palindrome (66928282966).

The spelling of 21523150454 in words is "twenty-one billion, five hundred twenty-three million, one hundred fifty thousand, four hundred fifty-four".