21003010002 has 24 divisors (see below), whose sum is σ = 49007023884. Its totient is φ = 6462464544.

The previous prime is 21003009977. The next prime is 21003010019. The reversal of 21003010002 is 20001030012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18719986041 + 2283023961 = 136821^2 + 47781^2 .

It is a super-2 number, since 2×21003010002² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44877993 + ... + 44878460.

Almost surely, 2^21003010002 is an apocalyptic number.

21003010002 is an abundant number, since it is smaller than the sum of its proper divisors (28004013882).

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

21003010002 is a wasteful number, since it uses less digits than its factorization.

21003010002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89756474 (or 89756471 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21003010002 its reverse (20001030012), we get a palindrome (41004040014).

The spelling of 21003010002 in words is "twenty-one billion, three million, ten thousand, two".