21121122102 has 32 divisors (see below), whose sum is σ = 42387360000. Its totient is φ = 7016230368.

The previous prime is 21121122073. The next prime is 21121122107. The reversal of 21121122102 is 20122112112.

It is a super-2 number, since 2×21121122102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121122107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2261799 + ... + 2271117.

It is an arithmetic number, because the mean of its divisors is an integer number (1324605000).

Almost surely, 2^21121122102 is an apocalyptic number.

21121122102 is an abundant number, since it is smaller than the sum of its proper divisors (21266237898).

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

21121122102 is a wasteful number, since it uses less digits than its factorization.

21121122102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10580.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21121122102 its reverse (20122112112), we get a palindrome (41243234214).

The spelling of 21121122102 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred two".