21220210122001 has 16 divisors (see below), whose sum is σ = 24042568366080. Its totient is φ = 18560640108880.

The previous prime is 21220210121989. The next prime is 21220210122071. The reversal of 21220210122001 is 10022101202212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21220210122001 - 2²¹ = 21220208024849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220210122071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347807581 + ... + 347868586.

It is an arithmetic number, because the mean of its divisors is an integer number (1502660522880).

Almost surely, 2^{21220210122001} is an apocalyptic number.

It is an amenable number.

21220210122001 is a deficient number, since it is larger than the sum of its proper divisors (2822358244079).

21220210122001 is a wasteful number, since it uses less digits than its factorization.

21220210122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695676284.

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

Adding to 21220210122001 its reverse (10022101202212), we get a palindrome (31242311324213).

The spelling of 21220210122001 in words is "twenty-one trillion, two hundred twenty billion, two hundred ten million, one hundred twenty-two thousand, one".