21264012846804 has 384 divisors, whose sum is σ = 63817937584128. Its totient is φ = 5360124741120.

The previous prime is 21264012846799. The next prime is 21264012846859. The reversal of 21264012846804 is 40864821046212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1335419587 + ... + 1335435509.

It is an arithmetic number, because the mean of its divisors is an integer number (166192545792).

Almost surely, 2^{21264012846804} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21264012846804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31908968792064).

21264012846804 is an abundant number, since it is smaller than the sum of its proper divisors (42553924737324).

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

21264012846804 is a wasteful number, since it uses less digits than its factorization.

21264012846804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16467 (or 16465 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 48.

The spelling of 21264012846804 in words is "twenty-one trillion, two hundred sixty-four billion, twelve million, eight hundred forty-six thousand, eight hundred four".