21022012212212 has 24 divisors (see below), whose sum is σ = 40133089012800. Its totient is φ = 9555422808960.

The previous prime is 21022012212197. The next prime is 21022012212217. The reversal of 21022012212212 is 21221221022012.

It is a super-2 number, since 2×21022012212212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022012212217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12717164 + ... + 14274812.

It is an arithmetic number, because the mean of its divisors is an integer number (1672212042200).

Almost surely, 2^{21022012212212} is an apocalyptic number.

21022012212212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21022012212212 is a deficient number, since it is larger than the sum of its proper divisors (19111076800588).

21022012212212 is a wasteful number, since it uses less digits than its factorization.

21022012212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864391 (or 1864389 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21022012212212 its reverse (21221221022012), we get a palindrome (42243233234224).

The spelling of 21022012212212 in words is "twenty-one trillion, twenty-two billion, twelve million, two hundred twelve thousand, two hundred twelve".