21611245574424 has 128 divisors (see below), whose sum is σ = 62471354457600. Its totient is φ = 6157259888640.

The previous prime is 21611245574371. The next prime is 21611245574431. The reversal of 21611245574424 is 42447554211612.

It is a super-3 number, since 3×21611245574424³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

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, 1850062 + ... + 6829730.

It is an arithmetic number, because the mean of its divisors is an integer number (488057456700).

Almost surely, 2^{21611245574424} is an apocalyptic number.

21611245574424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21611245574424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31235677228800).

21611245574424 is an abundant number, since it is smaller than the sum of its proper divisors (40860108883176).

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

21611245574424 is a wasteful number, since it uses less digits than its factorization.

21611245574424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4980673 (or 4980669 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 48.

The spelling of 21611245574424 in words is "twenty-one trillion, six hundred eleven billion, two hundred forty-five million, five hundred seventy-four thousand, four hundred twenty-four".