21124213144 has 16 divisors (see below), whose sum is σ = 39992443920. Its totient is φ = 10459561440.

The previous prime is 21124213111. The next prime is 21124213163. The reversal of 21124213144 is 44131242112.

It is a super-4 number, since 4×21124213144⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12817267 + ... + 12818914.

It is an arithmetic number, because the mean of its divisors is an integer number (2499527745).

Almost surely, 2^21124213144 is an apocalyptic number.

It is an amenable number.

21124213144 is a deficient number, since it is larger than the sum of its proper divisors (18868230776).

21124213144 is a wasteful number, since it uses less digits than its factorization.

21124213144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25636290 (or 25636286 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

Adding to 21124213144 its reverse (44131242112), we get a palindrome (65255455256).

The spelling of 21124213144 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirteen thousand, one hundred forty-four".