21121212022001 has 12 divisors (see below), whose sum is σ = 26138169401472. Its totient is φ = 16711288631856.

The previous prime is 21121212021997. The next prime is 21121212022021. The reversal of 21121212022001 is 10022021212112.

It is not a de Polignac number, because 21121212022001 - 2² = 21121212021997 is a prime.

It is a super-2 number, since 2×21121212022001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121212022021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8926969241 + ... + 8926971606.

It is an arithmetic number, because the mean of its divisors is an integer number (2178180783456).

Almost surely, 2^{21121212022001} is an apocalyptic number.

It is an amenable number.

21121212022001 is a deficient number, since it is larger than the sum of its proper divisors (5016957379471).

21121212022001 is a wasteful number, since it uses less digits than its factorization.

21121212022001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17853940880 (or 17853940867 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21121212022001 its reverse (10022021212112), we get a palindrome (31143233234113).

The spelling of 21121212022001 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, twenty-two thousand, one".