21012012112001 has 8 divisors (see below), whose sum is σ = 21419110960704. Its totient is φ = 20605307551920.

The previous prime is 21012012111971. The next prime is 21012012112067. The reversal of 21012012112001 is 10021121021012.

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

It is a cyclic number.

It is not a de Polignac number, because 21012012112001 - 2¹⁰ = 21012012110977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012012112501) 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, 98464541 + ... + 98677706.

It is an arithmetic number, because the mean of its divisors is an integer number (2677388870088).

Almost surely, 2^{21012012112001} is an apocalyptic number.

It is an amenable number.

21012012112001 is a deficient number, since it is larger than the sum of its proper divisors (407098848703).

21012012112001 is a wasteful number, since it uses less digits than its factorization.

21012012112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197144311.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012012112001 its reverse (10021121021012), we get a palindrome (31033133133013).

The spelling of 21012012112001 in words is "twenty-one trillion, twelve billion, twelve million, one hundred twelve thousand, one".