21220221201202 has 4 divisors (see below), whose sum is σ = 31830331801806. Its totient is φ = 10610110600600.

The previous prime is 21220221201197. The next prime is 21220221201259. The reversal of 21220221201202 is 20210212202212.

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

It can be written as a sum of positive squares in only one way, i.e., 11345977087641 + 9874244113561 = 3368379^2 + 3142331^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21220221201202.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305055300299 + ... + 5305055300302.

Almost surely, 2^{21220221201202} is an apocalyptic number.

21220221201202 is a deficient number, since it is larger than the sum of its proper divisors (10610110600604).

21220221201202 is a wasteful number, since it uses less digits than its factorization.

21220221201202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610110600603.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21220221201202 its reverse (20210212202212), we get a palindrome (41430433403414).

The spelling of 21220221201202 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred one thousand, two hundred two".