21210320222010 has 160 divisors (see below), whose sum is σ = 58120265115792. Its totient is φ = 5548221619200.

The previous prime is 21210320221991. The next prime is 21210320222029. The reversal of 21210320222010 is 1022202301212.

21210320222010 is a `hidden beast` number, since 2 + 121 + 0 + 320 + 2 + 220 + 1 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21210320221991) and next prime (21210320222029).

It can be written as a sum of positive squares in 8 ways, for example, as 888896352969 + 20321423869041 = 942813^2 + 4507929^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 218937502 + ... + 219034358.

Almost surely, 2^{21210320222010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210320222010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29060132557896).

21210320222010 is an abundant number, since it is smaller than the sum of its proper divisors (36909944893782).

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

21210320222010 is a wasteful number, since it uses less digits than its factorization.

21210320222010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102030 (or 102021 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21210320222010 its reverse (1022202301212), we get a palindrome (22232522523222).

The spelling of 21210320222010 in words is "twenty-one trillion, two hundred ten billion, three hundred twenty million, two hundred twenty-two thousand, ten".