21020230310 has 32 divisors (see below), whose sum is σ = 38508307200. Its totient is φ = 8259009760.

The previous prime is 21020230291. The next prime is 21020230331. The reversal of 21020230310 is 1303202012.

It is a happy number.

It is a super-2 number, since 2×21020230310² (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, 764705 + ... + 791715.

It is an arithmetic number, because the mean of its divisors is an integer number (1203384600).

Almost surely, 2^21020230310 is an apocalyptic number.

21020230310 is a deficient number, since it is larger than the sum of its proper divisors (17488076890).

21020230310 is a wasteful number, since it uses less digits than its factorization.

21020230310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28396.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21020230310 its reverse (1303202012), we get a palindrome (22323432322).

The spelling of 21020230310 in words is "twenty-one billion, twenty million, two hundred thirty thousand, three hundred ten".