821461254228719 has 16 divisors (see below), whose sum is σ = 899801945196000. Its totient is φ = 745334143551360.

The previous prime is 821461254228707. The next prime is 821461254228743. The reversal of 821461254228719 is 917822452164128.

It is a cyclic number.

It is not a de Polignac number, because 821461254228719 - 2⁸ = 821461254228463 is a prime.

It is a super-2 number, since 2×821461254228719² (a number of 31 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 (821461254258719) 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, 1022509844 + ... + 1023312905.

It is an arithmetic number, because the mean of its divisors is an integer number (56237621574750).

Almost surely, 2^{821461254228719} is an apocalyptic number.

821461254228719 is a deficient number, since it is larger than the sum of its proper divisors (78340690967281).

821461254228719 is a wasteful number, since it uses less digits than its factorization.

821461254228719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045823290.

The product of its digits is 30965760, while the sum is 62.

The spelling of 821461254228719 in words is "eight hundred twenty-one trillion, four hundred sixty-one billion, two hundred fifty-four million, two hundred twenty-eight thousand, seven hundred nineteen".