21420241002 has 24 divisors (see below), whose sum is σ = 46548252036. Its totient is φ = 7118891136.

The previous prime is 21420240997. The next prime is 21420241049. The reversal of 21420241002 is 20014202412.

21420241002 is a `hidden beast` number, since 2 + 1 + 420 + 241 + 0 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20583353961 + 836887041 = 143469^2 + 28929^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 1759533 + ... + 1771664.

Almost surely, 2^21420241002 is an apocalyptic number.

21420241002 is an abundant number, since it is smaller than the sum of its proper divisors (25128011034).

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

21420241002 is a wasteful number, since it uses less digits than its factorization.

21420241002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531542 (or 3531539 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21420241002 its reverse (20014202412), we get a palindrome (41434443414).

The spelling of 21420241002 in words is "twenty-one billion, four hundred twenty million, two hundred forty-one thousand, two".