21121021101122 has 4 divisors (see below), whose sum is σ = 31681531651686. Its totient is φ = 10560510550560.

The previous prime is 21121021101107. The next prime is 21121021101161. The reversal of 21121021101122 is 22110112012112.

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., 17706430825801 + 3414590275321 = 4207901^2 + 1847861^2 .

It is a super-3 number, since 3×21121021101122³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121021101122.

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, 5280255275279 + ... + 5280255275282.

Almost surely, 2^{21121021101122} is an apocalyptic number.

21121021101122 is a deficient number, since it is larger than the sum of its proper divisors (10560510550564).

21121021101122 is a wasteful number, since it uses less digits than its factorization.

21121021101122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10560510550563.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121021101122 its reverse (22110112012112), we get a palindrome (43231133113234).

The spelling of 21121021101122 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, one hundred one thousand, one hundred twenty-two".