21066643054 has 8 divisors (see below), whose sum is σ = 31605524568. Its totient is φ = 10531468200.

The previous prime is 21066643007. The next prime is 21066643109. The reversal of 21066643054 is 45034666012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912412 + ... + 935215.

It is an arithmetic number, because the mean of its divisors is an integer number (3950690571).

Almost surely, 2^21066643054 is an apocalyptic number.

21066643054 is a deficient number, since it is larger than the sum of its proper divisors (10538881514).

21066643054 is a wasteful number, since it uses less digits than its factorization.

21066643054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853330.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 21066643054 in words is "twenty-one billion, sixty-six million, six hundred forty-three thousand, fifty-four".