21121220102 has 8 divisors (see below), whose sum is σ = 31682557512. Its totient is φ = 10560367600.

The previous prime is 21121220093. The next prime is 21121220117. The reversal of 21121220102 is 20102212112.

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

It is a super-2 number, since 2×21121220102² (a number of 21 digits) contains 22 as substring.

It is a congruent 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, 21077 + ... + 206607.

It is an arithmetic number, because the mean of its divisors is an integer number (3960319689).

Almost surely, 2^21121220102 is an apocalyptic number.

21121220102 is a deficient number, since it is larger than the sum of its proper divisors (10561337410).

21121220102 is a wasteful number, since it uses less digits than its factorization.

21121220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242454.

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

Adding to 21121220102 its reverse (20102212112), we get a palindrome (41223432214).

The spelling of 21121220102 in words is "twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, one hundred two".