21020001220222 has 16 divisors (see below), whose sum is σ = 31544802748080. Its totient is φ = 10505067247872.

The previous prime is 21020001220201. The next prime is 21020001220223. The reversal of 21020001220222 is 22202210002012.

It is a junction number, because it is equal to n+sod(n) for n = 21020001220196 and 21020001220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020001220223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291467104 + ... + 291539212.

It is an arithmetic number, because the mean of its divisors is an integer number (1971550171755).

Almost surely, 2^{21020001220222} is an apocalyptic number.

21020001220222 is a deficient number, since it is larger than the sum of its proper divisors (10524801527858).

21020001220222 is a wasteful number, since it uses less digits than its factorization.

21020001220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138507.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21020001220222 its reverse (22202210002012), we get a palindrome (43222211222234).

The spelling of 21020001220222 in words is "twenty-one trillion, twenty billion, one million, two hundred twenty thousand, two hundred twenty-two".