21212210001 has 8 divisors (see below), whose sum is σ = 29047350784. Its totient is φ = 13759271280.

The previous prime is 21212209951. The next prime is 21212210059. The reversal of 21212210001 is 10001221212.

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

It is not a de Polignac number, because 21212210001 - 2⁷ = 21212209873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212210081) 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, 95550385 + ... + 95550606.

It is an arithmetic number, because the mean of its divisors is an integer number (3630918848).

Almost surely, 2^21212210001 is an apocalyptic number.

It is an amenable number.

21212210001 is a deficient number, since it is larger than the sum of its proper divisors (7835140783).

21212210001 is a wasteful number, since it uses less digits than its factorization.

21212210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191101031.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21212210001 its reverse (10001221212), we get a palindrome (31213431213).

It can be divided in two parts, 2121 and 2210001, that added together give a palindrome (2212122).

The spelling of 21212210001 in words is "twenty-one billion, two hundred twelve million, two hundred ten thousand, one".