21001421234211 has 16 divisors (see below), whose sum is σ = 31373130494208. Its totient is φ = 12384130456800.

The previous prime is 21001421234197. The next prime is 21001421234221. The reversal of 21001421234211 is 11243212410012.

It is not a de Polignac number, because 21001421234211 - 2¹⁵ = 21001421201443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001421234221) 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, 8600089375 + ... + 8600091816.

It is an arithmetic number, because the mean of its divisors is an integer number (1960820655888).

Almost surely, 2^{21001421234211} is an apocalyptic number.

21001421234211 is a deficient number, since it is larger than the sum of its proper divisors (10371709259997).

21001421234211 is a wasteful number, since it uses less digits than its factorization.

21001421234211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17200181242.

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 21001421234211 its reverse (11243212410012), we get a palindrome (32244633644223).

The spelling of 21001421234211 in words is "twenty-one trillion, one billion, four hundred twenty-one million, two hundred thirty-four thousand, two hundred eleven".