21002214004 has 12 divisors (see below), whose sum is σ = 38021249700. Its totient is φ = 10138999808.

The previous prime is 21002213993. The next prime is 21002214029. The reversal of 21002214004 is 40041220012.

It can be written as a sum of positive squares in 2 ways, for example, as 8290102500 + 12712111504 = 91050^2 + 112748^2 .

It is a congruent number.

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, 90526669 + ... + 90526900.

It is an arithmetic number, because the mean of its divisors is an integer number (3168437475).

Almost surely, 2^21002214004 is an apocalyptic number.

It is an amenable number.

21002214004 is a deficient number, since it is larger than the sum of its proper divisors (17019035696).

21002214004 is a wasteful number, since it uses less digits than its factorization.

21002214004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181053602 (or 181053600 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21002214004 its reverse (40041220012), we get a palindrome (61043434016).

The spelling of 21002214004 in words is "twenty-one billion, two million, two hundred fourteen thousand, four".