21211220202 has 8 divisors (see below), whose sum is σ = 42422440416. Its totient is φ = 7070406732.

The previous prime is 21211220183. The next prime is 21211220227. The reversal of 21211220202 is 20202211212.

It is a sphenic number, since it is the product of 3 distinct primes.

21211220202 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1767601678 + ... + 1767601689.

It is an arithmetic number, because the mean of its divisors is an integer number (5302805052).

Almost surely, 2^21211220202 is an apocalyptic number.

21211220202 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211220202 is a wasteful number, since it uses less digits than its factorization.

21211220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535203372.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21211220202 its reverse (20202211212), we get a palindrome (41413431414).

The spelling of 21211220202 in words is "twenty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred two".