21122121202122 has 64 divisors (see below), whose sum is σ = 43497644972544. Its totient is φ = 6835211274240.

The previous prime is 21122121202121. The next prime is 21122121202201. The reversal of 21122121202122 is 22120212122112.

It is a super-2 number, since 2×21122121202122² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122121202121) 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, 12218668 + ... + 13839800.

It is an arithmetic number, because the mean of its divisors is an integer number (679650702696).

Almost surely, 2^{21122121202122} is an apocalyptic number.

21122121202122 is an abundant number, since it is smaller than the sum of its proper divisors (22375523770422).

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

21122121202122 is a wasteful number, since it uses less digits than its factorization.

21122121202122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621663.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21122121202122 its reverse (22120212122112), we get a palindrome (43242333324234).

The spelling of 21122121202122 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty-two".