21403752526444 has 24 divisors (see below), whose sum is σ = 39043069370480. Its totient is φ = 10257223876416.

The previous prime is 21403752526439. The next prime is 21403752526483. The reversal of 21403752526444 is 44462525730412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1079243439 + ... + 1079263270.

Almost surely, 2^{21403752526444} is an apocalyptic number.

It is an amenable number.

21403752526444 is a deficient number, since it is larger than the sum of its proper divisors (17639316844036).

21403752526444 is a wasteful number, since it uses less digits than its factorization.

21403752526444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158506817 (or 2158506815 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 49.

The spelling of 21403752526444 in words is "twenty-one trillion, four hundred three billion, seven hundred fifty-two million, five hundred twenty-six thousand, four hundred forty-four".