21011212112001 has 32 divisors (see below), whose sum is σ = 28979420160000. Its totient is φ = 13527143562240.

The previous prime is 21011212111997. The next prime is 21011212112029. The reversal of 21011212112001 is 10021121211012.

It is a happy number.

It is not a de Polignac number, because 21011212112001 - 2² = 21011212111997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011212112201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 768811105 + ... + 768838433.

It is an arithmetic number, because the mean of its divisors is an integer number (905606880000).

Almost surely, 2^{21011212112001} is an apocalyptic number.

It is an amenable number.

21011212112001 is a deficient number, since it is larger than the sum of its proper divisors (7968208047999).

21011212112001 is a wasteful number, since it uses less digits than its factorization.

21011212112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44429.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011212112001 its reverse (10021121211012), we get a palindrome (31032333323013).

The spelling of 21011212112001 in words is "twenty-one trillion, eleven billion, two hundred twelve million, one hundred twelve thousand, one".