21210221212001 has 16 divisors (see below), whose sum is σ = 21737284208640. Its totient is φ = 20686348316880.

The previous prime is 21210221211943. The next prime is 21210221212003. The reversal of 21210221212001 is 10021212201212.

It is a cyclic number.

It is not a de Polignac number, because 21210221212001 - 2¹⁴ = 21210221195617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210221212003) 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, 60585980 + ... + 60935058.

It is an arithmetic number, because the mean of its divisors is an integer number (1358580263040).

Almost surely, 2^{21210221212001} is an apocalyptic number.

It is an amenable number.

21210221212001 is a deficient number, since it is larger than the sum of its proper divisors (527062996639).

21210221212001 is a wasteful number, since it uses less digits than its factorization.

21210221212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353644.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21210221212001 its reverse (10021212201212), we get a palindrome (31231433413213).

The spelling of 21210221212001 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, two hundred twelve thousand, one".