21021020310 has 32 divisors (see below), whose sum is σ = 53105736960. Its totient is φ = 5310573408.

The previous prime is 21021020239. The next prime is 21021020323. The reversal of 21021020310 is 1302012012.

It is a super-2 number, since 2×21021020310² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 18438922 + ... + 18440061.

It is an arithmetic number, because the mean of its divisors is an integer number (1659554280).

Almost surely, 2^21021020310 is an apocalyptic number.

21021020310 is an abundant number, since it is smaller than the sum of its proper divisors (32084716650).

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

21021020310 is a wasteful number, since it uses less digits than its factorization.

21021020310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36879012.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21021020310 its reverse (1302012012), we get a palindrome (22323032322).

The spelling of 21021020310 in words is "twenty-one billion, twenty-one million, twenty thousand, three hundred ten".