21000121120122 has 16 divisors (see below), whose sum is σ = 44210781305760. Its totient is φ = 6631617195792.

The previous prime is 21000121120117. The next prime is 21000121120127. The reversal of 21000121120122 is 22102112100012.

It is an interprime number because it is at equal distance from previous prime (21000121120117) and next prime (21000121120127).

It is not an unprimeable number, because it can be changed into a prime (21000121120127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92105794273 + ... + 92105794500.

It is an arithmetic number, because the mean of its divisors is an integer number (2763173831610).

Almost surely, 2^{21000121120122} is an apocalyptic number.

21000121120122 is an abundant number, since it is smaller than the sum of its proper divisors (23210660185638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000121120122 is a wasteful number, since it uses less digits than its factorization.

21000121120122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184211588797.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21000121120122 its reverse (22102112100012), we get a palindrome (43102233220134).

The spelling of 21000121120122 in words is "twenty-one trillion, one hundred twenty-one million, one hundred twenty thousand, one hundred twenty-two".