21220031010 has 16 divisors (see below), whose sum is σ = 50928074496. Its totient is φ = 5658674928.

The previous prime is 21220031009. The next prime is 21220031011. The reversal of 21220031010 is 1013002212.

It is an interprime number because it is at equal distance from previous prime (21220031009) and next prime (21220031011).

It is not an unprimeable number, because it can be changed into a prime (21220031011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353667154 + ... + 353667213.

It is an arithmetic number, because the mean of its divisors is an integer number (3183004656).

Almost surely, 2^21220031010 is an apocalyptic number.

21220031010 is an abundant number, since it is smaller than the sum of its proper divisors (29708043486).

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

21220031010 is a wasteful number, since it uses less digits than its factorization.

21220031010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707334377.

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

Adding to 21220031010 its reverse (1013002212), we get a palindrome (22233033222).

The spelling of 21220031010 in words is "twenty-one billion, two hundred twenty million, thirty-one thousand, ten".