21220331242 has 32 divisors (see below), whose sum is σ = 35990000640. Its totient is φ = 9298774080.

The previous prime is 21220331227. The next prime is 21220331267. The reversal of 21220331242 is 24213302212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30858 + ... + 208309.

It is an arithmetic number, because the mean of its divisors is an integer number (1124687520).

Almost surely, 2^21220331242 is an apocalyptic number.

21220331242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21220331242 is a deficient number, since it is larger than the sum of its proper divisors (14769669398).

21220331242 is a wasteful number, since it uses less digits than its factorization.

21220331242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239326.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21220331242 its reverse (24213302212), we get a palindrome (45433633454).

The spelling of 21220331242 in words is "twenty-one billion, two hundred twenty million, three hundred thirty-one thousand, two hundred forty-two".