21011222222012 has 24 divisors (see below), whose sum is σ = 40115444140800. Its totient is φ = 9549814886960.

The previous prime is 21011222222009. The next prime is 21011222222027. The reversal of 21011222222012 is 21022222211012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17942708 + ... + 19077819.

It is an arithmetic number, because the mean of its divisors is an integer number (1671476839200).

Almost surely, 2^{21011222222012} is an apocalyptic number.

21011222222012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21011222222012 is a deficient number, since it is larger than the sum of its proper divisors (19104221918788).

21011222222012 is a wasteful number, since it uses less digits than its factorization.

21011222222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37033441 (or 37033439 counting only the distinct ones).

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

Adding to 21011222222012 its reverse (21022222211012), we get a palindrome (42033444433024).

The spelling of 21011222222012 in words is "twenty-one trillion, eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, twelve".