21000011001222 has 16 divisors (see below), whose sum is σ = 45818205820992. Its totient is φ = 6363639697320.

The previous prime is 21000011001217. The next prime is 21000011001239. The reversal of 21000011001222 is 22210011000012.

It is a junction number, because it is equal to n+sod(n) for n = 21000011001198 and 21000011001207.

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, 159090992368 + ... + 159090992499.

It is an arithmetic number, because the mean of its divisors is an integer number (2863637863812).

Almost surely, 2^{21000011001222} is an apocalyptic number.

21000011001222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000011001222 is an abundant number, since it is smaller than the sum of its proper divisors (24818194819770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000011001222 is a wasteful number, since it uses less digits than its factorization.

21000011001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318181984883.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21000011001222 its reverse (22210011000012), we get a palindrome (43210022001234).

The spelling of 21000011001222 in words is "twenty-one trillion, eleven million, one thousand, two hundred twenty-two".