21213421210 has 16 divisors (see below), whose sum is σ = 39415905792. Its totient is φ = 8211646800.

The previous prime is 21213421153. The next prime is 21213421247. The reversal of 21213421210 is 1212431212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34214886 + ... + 34215505.

It is an arithmetic number, because the mean of its divisors is an integer number (2463494112).

Almost surely, 2^21213421210 is an apocalyptic number.

21213421210 is a deficient number, since it is larger than the sum of its proper divisors (18202484582).

21213421210 is a wasteful number, since it uses less digits than its factorization.

21213421210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68430429.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21213421210 its reverse (1212431212), we get a palindrome (22425852422).

The spelling of 21213421210 in words is "twenty-one billion, two hundred thirteen million, four hundred twenty-one thousand, two hundred ten".