21111222002201 has 8 divisors (see below), whose sum is σ = 22029194372544. Its totient is φ = 20193257394640.

The previous prime is 21111222002179. The next prime is 21111222002243. The reversal of 21111222002201 is 10220022211112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111222002201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111222002201.

It is not an unprimeable number, because it can be changed into a prime (21111222002281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4004135 + ... + 7632531.

It is an arithmetic number, because the mean of its divisors is an integer number (2753649296568).

Almost surely, 2^{21111222002201} is an apocalyptic number.

It is an amenable number.

21111222002201 is a deficient number, since it is larger than the sum of its proper divisors (917972370343).

21111222002201 is a wasteful number, since it uses less digits than its factorization.

21111222002201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881391.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21111222002201 its reverse (10220022211112), we get a palindrome (31331244213313).

The spelling of 21111222002201 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-two million, two thousand, two hundred one".