21121212212110 has 8 divisors (see below), whose sum is σ = 38018181981816. Its totient is φ = 8448484884840.

The previous prime is 21121212212101. The next prime is 21121212212167. The reversal of 21121212212110 is 1121221212112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21121212212110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056060610596 + ... + 1056060610615.

It is an arithmetic number, because the mean of its divisors is an integer number (4752272747727).

Almost surely, 2^{21121212212110} is an apocalyptic number.

21121212212110 is a deficient number, since it is larger than the sum of its proper divisors (16896969769706).

21121212212110 is a wasteful number, since it uses less digits than its factorization.

21121212212110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112121221218.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21121212212110 its reverse (1121221212112), we get a palindrome (22242433424222).

The spelling of 21121212212110 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred ten".