21154412112 has 20 divisors (see below), whose sum is σ = 54648898080. Its totient is φ = 7051470688.

The previous prime is 21154412107. The next prime is 21154412117. The reversal of 21154412112 is 21121445112.

It is an interprime number because it is at equal distance from previous prime (21154412107) and next prime (21154412117).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154412117) 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, 220358412 + ... + 220358507.

It is an arithmetic number, because the mean of its divisors is an integer number (2732444904).

Almost surely, 2^21154412112 is an apocalyptic number.

It is an amenable number.

21154412112 is an abundant number, since it is smaller than the sum of its proper divisors (33494485968).

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

21154412112 is a wasteful number, since it uses less digits than its factorization.

21154412112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440716930 (or 440716924 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

Adding to 21154412112 its reverse (21121445112), we get a palindrome (42275857224).

The spelling of 21154412112 in words is "twenty-one billion, one hundred fifty-four million, four hundred twelve thousand, one hundred twelve".