21142420202 has 8 divisors (see below), whose sum is σ = 33382768800. Its totient is φ = 10014830604.

The previous prime is 21142420199. The next prime is 21142420207. The reversal of 21142420202 is 20202424112.

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

It is not an unprimeable number, because it can be changed into a prime (21142420207) 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, 278189702 + ... + 278189777.

It is an arithmetic number, because the mean of its divisors is an integer number (4172846100).

Almost surely, 2^21142420202 is an apocalyptic number.

21142420202 is a deficient number, since it is larger than the sum of its proper divisors (12240348598).

21142420202 is a wasteful number, since it uses less digits than its factorization.

21142420202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556379500.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21142420202 its reverse (20202424112), we get a palindrome (41344844314).

The spelling of 21142420202 in words is "twenty-one billion, one hundred forty-two million, four hundred twenty thousand, two hundred two".