21403311423444 has 36 divisors (see below), whose sum is σ = 54107856755316. Its totient is φ = 7133772292608.

The previous prime is 21403311423407. The next prime is 21403311423451. The reversal of 21403311423444 is 44432411330412.

21403311423444 is a `hidden beast` number, since 2 + 1 + 40 + 3 + 31 + 142 + 3 + 444 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1019332544400 + 20383978879044 = 1009620^2 + 4514862^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21403311423444² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21403311423399 and 21403311423408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27310269 + ... + 28083044.

It is an arithmetic number, because the mean of its divisors is an integer number (1502996020981).

Almost surely, 2^{21403311423444} is an apocalyptic number.

It is an amenable number.

21403311423444 is an abundant number, since it is smaller than the sum of its proper divisors (32704545331872).

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

21403311423444 is a wasteful number, since it uses less digits than its factorization.

21403311423444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55404056 (or 55404051 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

Adding to 21403311423444 its reverse (44432411330412), we get a palindrome (65835722753856).

The spelling of 21403311423444 in words is "twenty-one trillion, four hundred three billion, three hundred eleven million, four hundred twenty-three thousand, four hundred forty-four".