21020002121222 has 64 divisors (see below), whose sum is σ = 34714227609600. Its totient is φ = 9487147213440.

The previous prime is 21020002121213. The next prime is 21020002121227. The reversal of 21020002121222 is 22212120002012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020002121222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020002121227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 619475597 + ... + 619509527.

It is an arithmetic number, because the mean of its divisors is an integer number (542409806400).

Almost surely, 2^{21020002121222} is an apocalyptic number.

21020002121222 is a deficient number, since it is larger than the sum of its proper divisors (13694225488378).

21020002121222 is a wasteful number, since it uses less digits than its factorization.

21020002121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36901.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21020002121222 its reverse (22212120002012), we get a palindrome (43232122123234).

The spelling of 21020002121222 in words is "twenty-one trillion, twenty billion, two million, one hundred twenty-one thousand, two hundred twenty-two".