21222212101 has 8 divisors (see below), whose sum is σ = 21398393408. Its totient is φ = 21046500000.

The previous prime is 21222212087. The next prime is 21222212111. The reversal of 21222212101 is 10121222212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21222212101 - 2¹⁹ = 21221687813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222212111) 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, 26175 + ... + 207676.

It is an arithmetic number, because the mean of its divisors is an integer number (2674799176).

Almost surely, 2^21222212101 is an apocalyptic number.

It is an amenable number.

21222212101 is a deficient number, since it is larger than the sum of its proper divisors (176181307).

21222212101 is a wasteful number, since it uses less digits than its factorization.

21222212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234603.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21222212101 its reverse (10121222212), we get a palindrome (31343434313).

It can be divided in two parts, 21222212 and 101, that multiplied together give a palindrome (2143443412).

The spelling of 21222212101 in words is "twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred one".