21215355310 has 16 divisors (see below), whose sum is σ = 38813667552. Its totient is φ = 8347024800.

The previous prime is 21215355289. The next prime is 21215355313. The reversal of 21215355310 is 1355351212.

It is a super-2 number, since 2×21215355310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215355313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17389026 + ... + 17390245.

It is an arithmetic number, because the mean of its divisors is an integer number (2425854222).

Almost surely, 2^21215355310 is an apocalyptic number.

21215355310 is a deficient number, since it is larger than the sum of its proper divisors (17598312242).

21215355310 is a wasteful number, since it uses less digits than its factorization.

21215355310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34779339.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 21215355310 in words is "twenty-one billion, two hundred fifteen million, three hundred fifty-five thousand, three hundred ten".