21210111022012 has 48 divisors (see below), whose sum is σ = 40550147118432. Its totient is φ = 9627125114880.

The previous prime is 21210111021973. The next prime is 21210111022013. The reversal of 21210111022012 is 21022011101212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210111022013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339477208 + ... + 339539680.

It is an arithmetic number, because the mean of its divisors is an integer number (844794731634).

Almost surely, 2^{21210111022012} is an apocalyptic number.

21210111022012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21210111022012 is a deficient number, since it is larger than the sum of its proper divisors (19340036096420).

21210111022012 is a wasteful number, since it uses less digits than its factorization.

21210111022012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73438 (or 73436 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210111022012 its reverse (21022011101212), we get a palindrome (42232122123224).

The spelling of 21210111022012 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, twenty-two thousand, twelve".