21016432004 has 12 divisors (see below), whose sum is σ = 36981954828. Its totient is φ = 10450159200.

The previous prime is 21016432001. The next prime is 21016432043. The reversal of 21016432004 is 40023461012.

It can be written as a sum of positive squares in 2 ways, for example, as 6034182400 + 14982249604 = 77680^2 + 122402^2 .

It is not an unprimeable number, because it can be changed into a prime (21016432001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14513387 + ... + 14514834.

It is an arithmetic number, because the mean of its divisors is an integer number (3081829569).

Almost surely, 2^21016432004 is an apocalyptic number.

It is an amenable number.

21016432004 is a deficient number, since it is larger than the sum of its proper divisors (15965522824).

21016432004 is a wasteful number, since it uses less digits than its factorization.

21016432004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29028406 (or 29028404 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21016432004 its reverse (40023461012), we get a palindrome (61039893016).

The spelling of 21016432004 in words is "twenty-one billion, sixteen million, four hundred thirty-two thousand, four".