21242043002 has 4 divisors (see below), whose sum is σ = 31863064506. Its totient is φ = 10621021500.

The previous prime is 21242042971. The next prime is 21242043013. The reversal of 21242043002 is 20034024212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10874526961 + 10367516041 = 104281^2 + 101821^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310510749 + ... + 5310510752.

Almost surely, 2^21242043002 is an apocalyptic number.

21242043002 is a deficient number, since it is larger than the sum of its proper divisors (10621021504).

21242043002 is a wasteful number, since it uses less digits than its factorization.

21242043002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10621021503.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21242043002 its reverse (20034024212), we get a palindrome (41276067214).

The spelling of 21242043002 in words is "twenty-one billion, two hundred forty-two million, forty-three thousand, two".