21201211102 has 4 divisors (see below), whose sum is σ = 31801816656. Its totient is φ = 10600605550.

The previous prime is 21201211093. The next prime is 21201211111. The reversal of 21201211102 is 20111210212.

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

It is an interprime number because it is at equal distance from previous prime (21201211093) and next prime (21201211111).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300302774 + ... + 5300302777.

It is an arithmetic number, because the mean of its divisors is an integer number (7950454164).

Almost surely, 2^21201211102 is an apocalyptic number.

21201211102 is a deficient number, since it is larger than the sum of its proper divisors (10600605554).

21201211102 is a wasteful number, since it uses less digits than its factorization.

21201211102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10600605553.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201211102 its reverse (20111210212), we get a palindrome (41312421314).

The spelling of 21201211102 in words is "twenty-one billion, two hundred one million, two hundred eleven thousand, one hundred two".