21035570677 has 16 divisors (see below), whose sum is σ = 23185761984. Its totient is φ = 18925200000.

The previous prime is 21035570657. The next prime is 21035570729. The reversal of 21035570677 is 77607553012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21035570677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035570657) 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, 4665058 + ... + 4669564.

It is an arithmetic number, because the mean of its divisors is an integer number (1449110124).

Almost surely, 2^21035570677 is an apocalyptic number.

It is an amenable number.

21035570677 is a deficient number, since it is larger than the sum of its proper divisors (2150191307).

21035570677 is a wasteful number, since it uses less digits than its factorization.

21035570677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8820.

The product of its (nonzero) digits is 308700, while the sum is 43.

The spelling of 21035570677 in words is "twenty-one billion, thirty-five million, five hundred seventy thousand, six hundred seventy-seven".