21210100121001 has 16 divisors (see below), whose sum is σ = 30851228986560. Its totient is φ = 12854533523520.

The previous prime is 21210100120969. The next prime is 21210100121003. The reversal of 21210100121001 is 10012100101212.

It is not a de Polignac number, because 21210100121001 - 2⁵ = 21210100120969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210100121003) 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, 4436811 + ... + 7880703.

It is an arithmetic number, because the mean of its divisors is an integer number (1928201811660).

Almost surely, 2^{21210100121001} is an apocalyptic number.

It is an amenable number.

21210100121001 is a deficient number, since it is larger than the sum of its proper divisors (9641128865559).

21210100121001 is a wasteful number, since it uses less digits than its factorization.

21210100121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630536.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210100121001 its reverse (10012100101212), we get a palindrome (31222200222213).

The spelling of 21210100121001 in words is "twenty-one trillion, two hundred ten billion, one hundred million, one hundred twenty-one thousand, one".