821276726406 has 16 divisors (see below), whose sum is σ = 1695539048448. Its totient is φ = 264927976200.

The previous prime is 821276726401. The next prime is 821276726419. The reversal of 821276726406 is 604627672128.

It is a super-2 number, since 2×821276726406² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821276726401) 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, 2207732950 + ... + 2207733321.

It is an arithmetic number, because the mean of its divisors is an integer number (105971190528).

Almost surely, 2^821276726406 is an apocalyptic number.

821276726406 is an abundant number, since it is smaller than the sum of its proper divisors (874262322042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821276726406 is a wasteful number, since it uses less digits than its factorization.

821276726406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4415466307.

The product of its (nonzero) digits is 2709504, while the sum is 51.

The spelling of 821276726406 in words is "eight hundred twenty-one billion, two hundred seventy-six million, seven hundred twenty-six thousand, four hundred six".