821727954619 has 64 divisors (see below), whose sum is σ = 1082016714240. Its totient is φ = 612045342720.

The previous prime is 821727954617. The next prime is 821727954637. The reversal of 821727954619 is 916459727128.

It is a cyclic number.

It is not a de Polignac number, because 821727954619 - 2¹ = 821727954617 is a prime.

It is a super-2 number, since 2×821727954619² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (821727954617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2895924 + ... + 3166990.

It is an arithmetic number, because the mean of its divisors is an integer number (16906511160).

Almost surely, 2^821727954619 is an apocalyptic number.

821727954619 is a deficient number, since it is larger than the sum of its proper divisors (260288759621).

821727954619 is a wasteful number, since it uses less digits than its factorization.

821727954619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271180.

The product of its digits is 15240960, while the sum is 61.

The spelling of 821727954619 in words is "eight hundred twenty-one billion, seven hundred twenty-seven million, nine hundred fifty-four thousand, six hundred nineteen".