21354661646446 has 64 divisors (see below), whose sum is σ = 34412912197632. Its totient is φ = 9903374433792.

The previous prime is 21354661646401. The next prime is 21354661646459. The reversal of 21354661646446 is 64464616645312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387344535 + ... + 387399661.

It is an arithmetic number, because the mean of its divisors is an integer number (537701753088).

Almost surely, 2^{21354661646446} is an apocalyptic number.

21354661646446 is a deficient number, since it is larger than the sum of its proper divisors (13058250551186).

21354661646446 is a wasteful number, since it uses less digits than its factorization.

21354661646446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55873.

The product of its digits is 59719680, while the sum is 58.

The spelling of 21354661646446 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred sixty-one million, six hundred forty-six thousand, four hundred forty-six".