21012100101212 has 24 divisors (see below), whose sum is σ = 40115388846960. Its totient is φ = 9550626124160.

The previous prime is 21012100101199. The next prime is 21012100101227. The reversal of 21012100101212 is 21210100121012.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 6915443 + ... + 9478794.

It is an arithmetic number, because the mean of its divisors is an integer number (1671474535290).

Almost surely, 2^{21012100101212} is an apocalyptic number.

21012100101212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21012100101212 is a deficient number, since it is larger than the sum of its proper divisors (19103288745748).

21012100101212 is a wasteful number, since it uses less digits than its factorization.

21012100101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16423381 (or 16423379 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012100101212 its reverse (21210100121012), we get a palindrome (42222200222224).

The spelling of 21012100101212 in words is "twenty-one trillion, twelve billion, one hundred million, one hundred one thousand, two hundred twelve".