21122021121202 has 4 divisors (see below), whose sum is σ = 31683031681806. Its totient is φ = 10561010560600.

The previous prime is 21122021121199. The next prime is 21122021121217. The reversal of 21122021121202 is 20212112022112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11183065003881 + 9938956117321 = 3344109^2 + 3152611^2 .

It is a super-2 number, since 2×21122021121202² (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 21122021121202.

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 as a sum of consecutive naturals, namely, 5280505280299 + ... + 5280505280302.

Almost surely, 2^{21122021121202} is an apocalyptic number.

21122021121202 is a deficient number, since it is larger than the sum of its proper divisors (10561010560604).

21122021121202 is a wasteful number, since it uses less digits than its factorization.

21122021121202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561010560603.

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

Adding to 21122021121202 its reverse (20212112022112), we get a palindrome (41334133143314).

The spelling of 21122021121202 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, one hundred twenty-one thousand, two hundred two".