21001212022001 has 8 divisors (see below), whose sum is σ = 21218483050464. Its totient is φ = 20783956579200.

The previous prime is 21001212021991. The next prime is 21001212022039. The reversal of 21001212022001 is 10022021210012.

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

It is not a de Polignac number, because 21001212022001 - 2¹⁴ = 21001212005617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001212022081) 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, 1177775 + ... + 6587076.

It is an arithmetic number, because the mean of its divisors is an integer number (2652310381308).

Almost surely, 2^{21001212022001} is an apocalyptic number.

It is an amenable number.

21001212022001 is a deficient number, since it is larger than the sum of its proper divisors (217271028463).

21001212022001 is an equidigital number, since it uses as much as digits as its factorization.

21001212022001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7792831.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001212022001 its reverse (10022021210012), we get a palindrome (31023233232013).

The spelling of 21001212022001 in words is "twenty-one trillion, one billion, two hundred twelve million, twenty-two thousand, one".