21155430002 has 8 divisors (see below), whose sum is σ = 36266451456. Its totient is φ = 9066612852.

The previous prime is 21155430001. The next prime is 21155430007. The reversal of 21155430002 is 20003455112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21155430002.

It is not an unprimeable number, because it can be changed into a prime (21155430001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755551058 + ... + 755551085.

It is an arithmetic number, because the mean of its divisors is an integer number (4533306432).

Almost surely, 2^21155430002 is an apocalyptic number.

21155430002 is a deficient number, since it is larger than the sum of its proper divisors (15111021454).

21155430002 is a wasteful number, since it uses less digits than its factorization.

21155430002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511102152.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21155430002 its reverse (20003455112), we get a palindrome (41158885114).

The spelling of 21155430002 in words is "twenty-one billion, one hundred fifty-five million, four hundred thirty thousand, two".