20021211212122 has 16 divisors (see below), whose sum is σ = 30417702531840. Its totient is φ = 9882024836112.

The previous prime is 20021211212087. The next prime is 20021211212129. The reversal of 20021211212122 is 22121211212002.

It is a self number, because there is not a number n which added to its sum of digits gives 20021211212122.

It is not an unprimeable number, because it can be changed into a prime (20021211212129) 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, 11109753 + ... + 12785500.

It is an arithmetic number, because the mean of its divisors is an integer number (1901106408240).

Almost surely, 2^{20021211212122} is an apocalyptic number.

20021211212122 is a deficient number, since it is larger than the sum of its proper divisors (10396491319718).

20021211212122 is a wasteful number, since it uses less digits than its factorization.

20021211212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23900637.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20021211212122 its reverse (22121211212002), we get a palindrome (42142422424124).

The spelling of 20021211212122 in words is "twenty trillion, twenty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-two".