21001200111222 has 64 divisors (see below), whose sum is σ = 43925518460160. Its totient is φ = 6687090705024.

The previous prime is 21001200111209. The next prime is 21001200111247. The reversal of 21001200111222 is 22211100210012.

It is a super-2 number, since 2×21001200111222² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9087633 + ... + 11161875.

It is an arithmetic number, because the mean of its divisors is an integer number (686336225940).

Almost surely, 2^{21001200111222} is an apocalyptic number.

21001200111222 is an abundant number, since it is smaller than the sum of its proper divisors (22924318348938).

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

21001200111222 is a wasteful number, since it uses less digits than its factorization.

21001200111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075117.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21001200111222 its reverse (22211100210012), we get a palindrome (43212300321234).

The spelling of 21001200111222 in words is "twenty-one trillion, one billion, two hundred million, one hundred eleven thousand, two hundred twenty-two".