21020310020310 has 64 divisors (see below), whose sum is σ = 51524619927552. Its totient is φ = 5485885808256.

The previous prime is 21020310020293. The next prime is 21020310020363. The reversal of 21020310020310 is 1302001302012.

It is a super-2 number, since 2×21020310020310² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020310020310.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29607444 + ... + 30309096.

It is an arithmetic number, because the mean of its divisors is an integer number (805072186368).

Almost surely, 2^{21020310020310} is an apocalyptic number.

21020310020310 is an abundant number, since it is smaller than the sum of its proper divisors (30504309907242).

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

21020310020310 is a wasteful number, since it uses less digits than its factorization.

21020310020310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722957.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21020310020310 its reverse (1302001302012), we get a palindrome (22322311322322).

The spelling of 21020310020310 in words is "twenty-one trillion, twenty billion, three hundred ten million, twenty thousand, three hundred ten".