621204402126 has 128 divisors (see below), whose sum is σ = 1564339101696. Its totient is φ = 159753329280.

The previous prime is 621204402101. The next prime is 621204402139.

621204402126 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×621204402126² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621204402093 and 621204402102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 160806871 + ... + 160810733.

It is an arithmetic number, because the mean of its divisors is an integer number (12221399232).

Almost surely, 2^621204402126 is an apocalyptic number.

621204402126 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 621204402126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782169550848).

621204402126 is an abundant number, since it is smaller than the sum of its proper divisors (943134699570).

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

621204402126 is a wasteful number, since it uses less digits than its factorization.

621204402126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7246.

The product of its (nonzero) digits is 9216, while the sum is 30.

The spelling of 621204402126 in words is "six hundred twenty-one billion, two hundred four million, four hundred two thousand, one hundred twenty-six".