21121210020122 has 16 divisors (see below), whose sum is σ = 33354727684800. Its totient is φ = 10003149082080.

The previous prime is 21121210020121. The next prime is 21121210020223. The reversal of 21121210020122 is 22102001212112.

It is a super-2 number, since 2×21121210020122² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121210020122.

It is not an unprimeable number, because it can be changed into a prime (21121210020121) 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, 45170222 + ... + 45635417.

It is an arithmetic number, because the mean of its divisors is an integer number (2084670480300).

Almost surely, 2^{21121210020122} is an apocalyptic number.

21121210020122 is a deficient number, since it is larger than the sum of its proper divisors (12233517664678).

21121210020122 is a wasteful number, since it uses less digits than its factorization.

21121210020122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90811781.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21121210020122 its reverse (22102001212112), we get a palindrome (43223211232234).

The spelling of 21121210020122 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, twenty thousand, one hundred twenty-two".