21002214152 has 8 divisors (see below), whose sum is σ = 39379151550. Its totient is φ = 10501107072.

The previous prime is 21002214151. The next prime is 21002214179. The reversal of 21002214152 is 25141220012.

It can be written as a sum of positive squares in only one way, i.e., 12747764836 + 8254449316 = 112906^2 + 90854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21002214151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312638377 + ... + 1312638392.

Almost surely, 2^21002214152 is an apocalyptic number.

It is an amenable number.

21002214152 is a deficient number, since it is larger than the sum of its proper divisors (18376937398).

21002214152 is a wasteful number, since it uses less digits than its factorization.

21002214152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625276775 (or 2625276771 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21002214152 its reverse (25141220012), we get a palindrome (46143434164).

The spelling of 21002214152 in words is "twenty-one billion, two million, two hundred fourteen thousand, one hundred fifty-two".