21111010101022 has 4 divisors (see below), whose sum is σ = 31666515151536. Its totient is φ = 10555505050510.

The previous prime is 21111010101011. The next prime is 21111010101023. The reversal of 21111010101022 is 22010101011112.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21111010100993 and 21111010101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111010101023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277752525254 + ... + 5277752525257.

It is an arithmetic number, because the mean of its divisors is an integer number (7916628787884).

Almost surely, 2^{21111010101022} is an apocalyptic number.

21111010101022 is a deficient number, since it is larger than the sum of its proper divisors (10555505050514).

21111010101022 is a wasteful number, since it uses less digits than its factorization.

21111010101022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555505050513.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21111010101022 its reverse (22010101011112), we get a palindrome (43121111112134).

The spelling of 21111010101022 in words is "twenty-one trillion, one hundred eleven billion, ten million, one hundred one thousand, twenty-two".