21211121202001 has 16 divisors (see below), whose sum is σ = 22184577535680. Its totient is φ = 20263463297280.

The previous prime is 21211121201999. The next prime is 21211121202041. The reversal of 21211121202001 is 10020212111212.

It is a cyclic number.

It is not a de Polignac number, because 21211121202001 - 2¹ = 21211121201999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211121202041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25076455 + ... + 25908508.

It is an arithmetic number, because the mean of its divisors is an integer number (1386536095980).

Almost surely, 2^{21211121202001} is an apocalyptic number.

It is an amenable number.

21211121202001 is a deficient number, since it is larger than the sum of its proper divisors (973456333679).

21211121202001 is a wasteful number, since it uses less digits than its factorization.

21211121202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50985216.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21211121202001 its reverse (10020212111212), we get a palindrome (31231333313213).

The spelling of 21211121202001 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred two thousand, one".