21001111084528 has 10 divisors (see below), whose sum is σ = 40689652726304. Its totient is φ = 10500555542256.

The previous prime is 21001111084517. The next prime is 21001111084561. The reversal of 21001111084528 is 82548011110012.

It is a junction number, because it is equal to n+sod(n) for n = 21001111084493 and 21001111084502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656284721376 + ... + 656284721407.

Almost surely, 2^{21001111084528} is an apocalyptic number.

It is an amenable number.

21001111084528 is a deficient number, since it is larger than the sum of its proper divisors (19688541641776).

21001111084528 is a wasteful number, since it uses less digits than its factorization.

21001111084528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312569442791 (or 1312569442785 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 34.

The spelling of 21001111084528 in words is "twenty-one trillion, one billion, one hundred eleven million, eighty-four thousand, five hundred twenty-eight".