21210002111001 has 64 divisors (see below), whose sum is σ = 32884137538560. Its totient is φ = 12025078560000.

The previous prime is 21210002110993. The next prime is 21210002111033. The reversal of 21210002111001 is 10011120001212.

It is not a de Polignac number, because 21210002111001 - 2³ = 21210002110993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210002111801) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23172006 + ... + 24069936.

It is an arithmetic number, because the mean of its divisors is an integer number (513814649040).

Almost surely, 2^{21210002111001} is an apocalyptic number.

It is an amenable number.

21210002111001 is a deficient number, since it is larger than the sum of its proper divisors (11674135427559).

21210002111001 is a wasteful number, since it uses less digits than its factorization.

21210002111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898438.

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

Adding to 21210002111001 its reverse (10011120001212), we get a palindrome (31221122112213).

It can be divided in two parts, 2121000211 and 1001, that added together give a palindrome (2121001212).

The spelling of 21210002111001 in words is "twenty-one trillion, two hundred ten billion, two million, one hundred eleven thousand, one".