21212021342 has 8 divisors (see below), whose sum is σ = 31819242000. Its totient is φ = 10605607344.

The previous prime is 21212021333. The next prime is 21212021353. The reversal of 21212021342 is 24312021212.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130967 + ... + 244082.

It is an arithmetic number, because the mean of its divisors is an integer number (3977405250).

Almost surely, 2^21212021342 is an apocalyptic number.

21212021342 is a deficient number, since it is larger than the sum of its proper divisors (10607220658).

21212021342 is a wasteful number, since it uses less digits than its factorization.

21212021342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403330.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21212021342 its reverse (24312021212), we get a palindrome (45524042554).

The spelling of 21212021342 in words is "twenty-one billion, two hundred twelve million, twenty-one thousand, three hundred forty-two".