21221202113 has 8 divisors (see below), whose sum is σ = 21299472000. Its totient is φ = 21143044080.

The previous prime is 21221202109. The next prime is 21221202131. The reversal of 21221202113 is 31120212212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221202113 - 2² = 21221202109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221202091 and 21221202100.

It is not an unprimeable number, because it can be changed into a prime (21221202143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362138 + ... + 416636.

It is an arithmetic number, because the mean of its divisors is an integer number (2662434000).

Almost surely, 2^21221202113 is an apocalyptic number.

It is an amenable number.

21221202113 is a deficient number, since it is larger than the sum of its proper divisors (78269887).

21221202113 is a wasteful number, since it uses less digits than its factorization.

21221202113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55927.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21221202113 its reverse (31120212212), we get a palindrome (52341414325).

The spelling of 21221202113 in words is "twenty-one billion, two hundred twenty-one million, two hundred two thousand, one hundred thirteen".