21354161004 has 96 divisors (see below), whose sum is σ = 60436051200. Its totient is φ = 6466625280.

The previous prime is 21354160999. The next prime is 21354161011. The reversal of 21354161004 is 40016145312.

It is a happy number.

21354161004 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 41 + 610 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2070292 + ... + 2080580.

It is an arithmetic number, because the mean of its divisors is an integer number (629542200).

Almost surely, 2^21354161004 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 21354161004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30218025600).

21354161004 is an abundant number, since it is smaller than the sum of its proper divisors (39081890196).

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

21354161004 is a wasteful number, since it uses less digits than its factorization.

21354161004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12060 (or 12052 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 21354161004 in words is "twenty-one billion, three hundred fifty-four million, one hundred sixty-one thousand, four".