21202212401 has 4 divisors (see below), whose sum is σ = 21695287152. Its totient is φ = 20709137652.

The previous prime is 21202212397. The next prime is 21202212457. The reversal of 21202212401 is 10421220212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21202212401 - 2² = 21202212397 is a prime.

It is a super-3 number, since 3×21202212401³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202212401.

It is not an unprimeable number, because it can be changed into a prime (21202212001) 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, 246537311 + ... + 246537396.

It is an arithmetic number, because the mean of its divisors is an integer number (5423821788).

Almost surely, 2^21202212401 is an apocalyptic number.

It is an amenable number.

21202212401 is a deficient number, since it is larger than the sum of its proper divisors (493074751).

21202212401 is an equidigital number, since it uses as much as digits as its factorization.

21202212401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493074750.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202212401 its reverse (10421220212), we get a palindrome (31623432613).

The spelling of 21202212401 in words is "twenty-one billion, two hundred two million, two hundred twelve thousand, four hundred one".