21652545454 has 8 divisors (see below), whose sum is σ = 32776789320. Its totient is φ = 10726949016.

The previous prime is 21652545451. The next prime is 21652545461. The reversal of 21652545454 is 45454525612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21652545454² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 21652545454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652545451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49661584 + ... + 49662019.

It is an arithmetic number, because the mean of its divisors is an integer number (4097098665).

Almost surely, 2^21652545454 is an apocalyptic number.

21652545454 is a deficient number, since it is larger than the sum of its proper divisors (11124243866).

21652545454 is a wasteful number, since it uses less digits than its factorization.

21652545454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99323714.

The product of its digits is 960000, while the sum is 43.

The spelling of 21652545454 in words is "twenty-one billion, six hundred fifty-two million, five hundred forty-five thousand, four hundred fifty-four".