21221011202 has 4 divisors (see below), whose sum is σ = 31831516806. Its totient is φ = 10610505600.

The previous prime is 21221011181. The next prime is 21221011241. The reversal of 21221011202 is 20211012212.

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., 10845347881 + 10375663321 = 104141^2 + 101861^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305252799 + ... + 5305252802.

Almost surely, 2^21221011202 is an apocalyptic number.

21221011202 is a deficient number, since it is larger than the sum of its proper divisors (10610505604).

21221011202 is a wasteful number, since it uses less digits than its factorization.

21221011202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610505603.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221011202 its reverse (20211012212), we get a palindrome (41432023414).

The spelling of 21221011202 in words is "twenty-one billion, two hundred twenty-one million, eleven thousand, two hundred two".