21894248677 has 32 divisors (see below), whose sum is σ = 26960940288. Its totient is φ = 17352631296.

The previous prime is 21894248647. The next prime is 21894248681. The reversal of 21894248677 is 77684249812.

It is not a de Polignac number, because 21894248677 - 2¹⁹ = 21893724389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894248617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3161823 + ... + 3168739.

It is an arithmetic number, because the mean of its divisors is an integer number (842529384).

Almost surely, 2^21894248677 is an apocalyptic number.

It is an amenable number.

21894248677 is a deficient number, since it is larger than the sum of its proper divisors (5066691611).

21894248677 is a wasteful number, since it uses less digits than its factorization.

21894248677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7405.

The product of its digits is 10838016, while the sum is 58.

The spelling of 21894248677 in words is "twenty-one billion, eight hundred ninety-four million, two hundred forty-eight thousand, six hundred seventy-seven".