21211212122102 has 4 divisors (see below), whose sum is σ = 31816818183156. Its totient is φ = 10605606061050.

The previous prime is 21211212122081. The next prime is 21211212122117. The reversal of 21211212122102 is 20122121211212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302803030524 + ... + 5302803030527.

It is an arithmetic number, because the mean of its divisors is an integer number (7954204545789).

Almost surely, 2^{21211212122102} is an apocalyptic number.

21211212122102 is a deficient number, since it is larger than the sum of its proper divisors (10605606061054).

21211212122102 is a wasteful number, since it uses less digits than its factorization.

21211212122102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605606061053.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21211212122102 its reverse (20122121211212), we get a palindrome (41333333333314).

The spelling of 21211212122102 in words is "twenty-one trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, one hundred two".