21210394370 has 96 divisors (see below), whose sum is σ = 43249360320. Its totient is φ = 7427203200.

The previous prime is 21210394367. The next prime is 21210394399. The reversal of 21210394370 is 7349301212.

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 47 ways as a sum of consecutive naturals, for example, 29915576 + ... + 29916284.

It is an arithmetic number, because the mean of its divisors is an integer number (450514170).

Almost surely, 2^21210394370 is an apocalyptic number.

21210394370 is an abundant number, since it is smaller than the sum of its proper divisors (22038965950).

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

21210394370 is a wasteful number, since it uses less digits than its factorization.

21210394370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072 (or 1041 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

Adding to 21210394370 its reverse (7349301212), we get a palindrome (28559695582).

The spelling of 21210394370 in words is "twenty-one billion, two hundred ten million, three hundred ninety-four thousand, three hundred seventy".