21426876677 has 8 divisors (see below), whose sum is σ = 21521661336. Its totient is φ = 21332180992.

The previous prime is 21426876649. The next prime is 21426876739. The reversal of 21426876677 is 77667862412.

It can be written as a sum of positive squares in 4 ways, for example, as 6541412641 + 14885464036 = 80879^2 + 122006^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21426876677 - 2²² = 21422682373 is a prime.

It is a super-2 number, since 2×21426876677² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426876637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485933 + ... + 528189.

It is an arithmetic number, because the mean of its divisors is an integer number (2690207667).

Almost surely, 2^21426876677 is an apocalyptic number.

It is an amenable number.

21426876677 is a deficient number, since it is larger than the sum of its proper divisors (94784659).

21426876677 is a wasteful number, since it uses less digits than its factorization.

21426876677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44487.

The product of its digits is 9483264, while the sum is 56.

The spelling of 21426876677 in words is "twenty-one billion, four hundred twenty-six million, eight hundred seventy-six thousand, six hundred seventy-seven".