21152766667677 has 16 divisors (see below), whose sum is σ = 28255759956480. Its totient is φ = 14075809845552.

The previous prime is 21152766667673. The next prime is 21152766667729. The reversal of 21152766667677 is 77676666725112.

It is not a de Polignac number, because 21152766667677 - 2² = 21152766667673 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152766667673) 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, 148700328 + ... + 148842510.

It is an arithmetic number, because the mean of its divisors is an integer number (1765984997280).

Almost surely, 2^{21152766667677} is an apocalyptic number.

It is an amenable number.

21152766667677 is a deficient number, since it is larger than the sum of its proper divisors (7102993288803).

21152766667677 is a wasteful number, since it uses less digits than its factorization.

21152766667677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233392.

The product of its digits is 373403520, while the sum is 69.

The spelling of 21152766667677 in words is "twenty-one trillion, one hundred fifty-two billion, seven hundred sixty-six million, six hundred sixty-seven thousand, six hundred seventy-seven".