21154423662 has 24 divisors (see below), whose sum is σ = 46279584624. Its totient is φ = 6983013024.

The previous prime is 21154423651. The next prime is 21154423669. The reversal of 21154423662 is 26632445112.

21154423662 is a `hidden beast` number, since 21 + 1 + 544 + 2 + 36 + 62 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154423669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5703223 + ... + 5706930.

It is an arithmetic number, because the mean of its divisors is an integer number (1928316026).

Almost surely, 2^21154423662 is an apocalyptic number.

21154423662 is an abundant number, since it is smaller than the sum of its proper divisors (25125160962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154423662 is a wasteful number, since it uses less digits than its factorization.

21154423662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11410264 (or 11410261 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

Adding to 21154423662 its reverse (26632445112), we get a palindrome (47786868774).

The spelling of 21154423662 in words is "twenty-one billion, one hundred fifty-four million, four hundred twenty-three thousand, six hundred sixty-two".