21121211202202 has 16 divisors (see below), whose sum is σ = 31990588785792. Its totient is φ = 10457689181040.

The previous prime is 21121211202193. The next prime is 21121211202229. The reversal of 21121211202202 is 20220211212112.

It is a super-2 number, since 2×21121211202202² (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 21121211202202.

It is an unprimeable number.

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, 3737988 + ... + 7497664.

It is an arithmetic number, because the mean of its divisors is an integer number (1999411799112).

Almost surely, 2^{21121211202202} is an apocalyptic number.

21121211202202 is a deficient number, since it is larger than the sum of its proper divisors (10869377583590).

21121211202202 is a wasteful number, since it uses less digits than its factorization.

21121211202202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787053.

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

Adding to 21121211202202 its reverse (20220211212112), we get a palindrome (41341422414314).

The spelling of 21121211202202 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, two hundred two thousand, two hundred two".