21220121022001 has 8 divisors (see below), whose sum is σ = 23156189335584. Its totient is φ = 19285213775520.

The previous prime is 21220121021989. The next prime is 21220121022007. The reversal of 21220121022001 is 10022012102212.

It is a happy number.

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

It is not a de Polignac number, because 21220121022001 - 2¹⁹ = 21220120497713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220121022007) 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, 290228556 + ... + 290301661.

It is an arithmetic number, because the mean of its divisors is an integer number (2894523666948).

Almost surely, 2^{21220121022001} is an apocalyptic number.

It is an amenable number.

21220121022001 is a deficient number, since it is larger than the sum of its proper divisors (1936068313583).

21220121022001 is a wasteful number, since it uses less digits than its factorization.

21220121022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580533551.

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

Adding to 21220121022001 its reverse (10022012102212), we get a palindrome (31242133124213).

The spelling of 21220121022001 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, twenty-two thousand, one".