21545854512 has 160 divisors (see below), whose sum is σ = 70098513408. Its totient is φ = 5550225408.

The previous prime is 21545854501. The next prime is 21545854523.

21545854512 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (21545854501) and next prime (21545854523).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130468 + ... + 245180.

Almost surely, 2^21545854512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21545854512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35049256704).

21545854512 is an abundant number, since it is smaller than the sum of its proper divisors (48552658896).

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

21545854512 is a wasteful number, since it uses less digits than its factorization.

21545854512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114787 (or 114781 counting only the distinct ones).

The product of its digits is 320000, while the sum is 42.

The spelling of 21545854512 in words is "twenty-one billion, five hundred forty-five million, eight hundred fifty-four thousand, five hundred twelve".