21050056601 has 16 divisors (see below), whose sum is σ = 24188027904. Its totient is φ = 17945051904.

The previous prime is 21050056597. The next prime is 21050056633. The reversal of 21050056601 is 10665005012.

It is not a de Polignac number, because 21050056601 - 2² = 21050056597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21050056691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990776 + ... + 1011798.

It is an arithmetic number, because the mean of its divisors is an integer number (1511751744).

Almost surely, 2^21050056601 is an apocalyptic number.

It is an amenable number.

21050056601 is a deficient number, since it is larger than the sum of its proper divisors (3137971303).

21050056601 is a wasteful number, since it uses less digits than its factorization.

21050056601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21800.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 21050056601 in words is "twenty-one billion, fifty million, fifty-six thousand, six hundred one".