21035212001 has 4 divisors (see below), whose sum is σ = 21380051604. Its totient is φ = 20690372400.

The previous prime is 21035211979. The next prime is 21035212039. The reversal of 21035212001 is 10021253012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2518534225 + 18516677776 = 50185^2 + 136076^2 .

It is a cyclic number.

It is not a de Polignac number, because 21035212001 - 2²⁶ = 20968103137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21035212301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172419710 + ... + 172419831.

It is an arithmetic number, because the mean of its divisors is an integer number (5345012901).

Almost surely, 2^21035212001 is an apocalyptic number.

It is an amenable number.

21035212001 is a deficient number, since it is larger than the sum of its proper divisors (344839603).

21035212001 is an equidigital number, since it uses as much as digits as its factorization.

21035212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344839602.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21035212001 its reverse (10021253012), we get a palindrome (31056465013).

The spelling of 21035212001 in words is "twenty-one billion, thirty-five million, two hundred twelve thousand, one".