21146543456606 has 16 divisors (see below), whose sum is σ = 32020375025520. Its totient is φ = 10473110503680.

The previous prime is 21146543456587. The next prime is 21146543456617. The reversal of 21146543456606 is 60665434564112.

It is a congruent number.

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, 4676435 + ... + 8010126.

It is an arithmetic number, because the mean of its divisors is an integer number (2001273439095).

Almost surely, 2^{21146543456606} is an apocalyptic number.

21146543456606 is a deficient number, since it is larger than the sum of its proper divisors (10873831568914).

21146543456606 is a wasteful number, since it uses less digits than its factorization.

21146543456606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12694459.

The product of its (nonzero) digits is 12441600, while the sum is 53.

The spelling of 21146543456606 in words is "twenty-one trillion, one hundred forty-six billion, five hundred forty-three million, four hundred fifty-six thousand, six hundred six".