21372743444 has 24 divisors (see below), whose sum is σ = 40284430368. Its totient is φ = 9863111520.

The previous prime is 21372743443. The next prime is 21372743461. The reversal of 21372743444 is 44434727312.

It is a super-3 number, since 3×21372743444³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21372743443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495719 + ... + 537105.

It is an arithmetic number, because the mean of its divisors is an integer number (1678517932).

Almost surely, 2^21372743444 is an apocalyptic number.

It is an amenable number.

21372743444 is a deficient number, since it is larger than the sum of its proper divisors (18911686924).

21372743444 is a wasteful number, since it uses less digits than its factorization.

21372743444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51335 (or 51333 counting only the distinct ones).

The product of its digits is 451584, while the sum is 41.

The spelling of 21372743444 in words is "twenty-one billion, three hundred seventy-two million, seven hundred forty-three thousand, four hundred forty-four".