21101222012108 has 24 divisors (see below), whose sum is σ = 42362909605632. Its totient is φ = 9008995380624.

The previous prime is 21101222012099. The next prime is 21101222012113. The reversal of 21101222012108 is 80121022210112.

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, 1432720910 + ... + 1432735637.

It is an arithmetic number, because the mean of its divisors is an integer number (1765121233568).

Almost surely, 2^{21101222012108} is an apocalyptic number.

21101222012108 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21101222012108 is an abundant number, since it is smaller than the sum of its proper divisors (21261687593524).

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

21101222012108 is a wasteful number, since it uses less digits than its factorization.

21101222012108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865456821 (or 2865456819 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 21101222012108 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-two million, twelve thousand, one hundred eight".