21122212210101 has 24 divisors (see below), whose sum is σ = 32983634692320. Its totient is φ = 12979794697056.

The previous prime is 21122212209991. The next prime is 21122212210193. The reversal of 21122212210101 is 10101221222112.

21122212210101 is a `hidden beast` number, since 21 + 122 + 212 + 210 + 101 = 666.

It is not a de Polignac number, because 21122212210101 - 2¹⁵ = 21122212177333 is a prime.

It is a super-2 number, since 2×21122212210101² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122212210201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1669205955 + ... + 1669218608.

It is an arithmetic number, because the mean of its divisors is an integer number (1374318112180).

Almost surely, 2^{21122212210101} is an apocalyptic number.

It is an amenable number.

21122212210101 is a deficient number, since it is larger than the sum of its proper divisors (11861422482219).

21122212210101 is a wasteful number, since it uses less digits than its factorization.

21122212210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338424625 (or 3338424622 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21122212210101 its reverse (10101221222112), we get a palindrome (31223433432213).

The spelling of 21122212210101 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twelve million, two hundred ten thousand, one hundred one".