21021211211122 has 16 divisors (see below), whose sum is σ = 31634238683520. Its totient is φ = 10476511340832.

The previous prime is 21021211211089. The next prime is 21021211211179. The reversal of 21021211211122 is 22111211212012.

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 21021211211122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10681678 + ... + 12495625.

It is an arithmetic number, because the mean of its divisors is an integer number (1977139917720).

Almost surely, 2^{21021211211122} is an apocalyptic number.

21021211211122 is a deficient number, since it is larger than the sum of its proper divisors (10613027472398).

21021211211122 is a wasteful number, since it uses less digits than its factorization.

21021211211122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23178777.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21021211211122 its reverse (22111211212012), we get a palindrome (43132422423134).

The spelling of 21021211211122 in words is "twenty-one trillion, twenty-one billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty-two".