21234432201604 has 12 divisors (see below), whose sum is σ = 37409654047500. Its totient is φ = 10545959616608.

The previous prime is 21234432201581. The next prime is 21234432201641. The reversal of 21234432201604 is 40610223443212.

It can be written as a sum of positive squares in 2 ways, for example, as 13166389616704 + 8068042584900 = 3628552^2 + 2840430^2 .

It is a super-2 number, since 2×21234432201604² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21234432201604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17814120379 + ... + 17814121570.

It is an arithmetic number, because the mean of its divisors is an integer number (3117471170625).

Almost surely, 2^{21234432201604} is an apocalyptic number.

It is an amenable number.

21234432201604 is a deficient number, since it is larger than the sum of its proper divisors (16175221845896).

21234432201604 is a wasteful number, since it uses less digits than its factorization.

21234432201604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35628242102 (or 35628242100 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

Adding to 21234432201604 its reverse (40610223443212), we get a palindrome (61844655644816).

The spelling of 21234432201604 in words is "twenty-one trillion, two hundred thirty-four billion, four hundred thirty-two million, two hundred one thousand, six hundred four".