21004142152 has 16 divisors (see below), whose sum is σ = 45008876160. Its totient is φ = 9001775184.

The previous prime is 21004142111. The next prime is 21004142183. The reversal of 21004142152 is 25124140012.

It is a super-2 number, since 2×21004142152² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187536928 + ... + 187537039.

It is an arithmetic number, because the mean of its divisors is an integer number (2813054760).

Almost surely, 2^21004142152 is an apocalyptic number.

It is an amenable number.

21004142152 is an abundant number, since it is smaller than the sum of its proper divisors (24004734008).

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

21004142152 is a wasteful number, since it uses less digits than its factorization.

21004142152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375073980 (or 375073976 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21004142152 its reverse (25124140012), we get a palindrome (46128282164).

The spelling of 21004142152 in words is "twenty-one billion, four million, one hundred forty-two thousand, one hundred fifty-two".