21122121102 has 16 divisors (see below), whose sum is σ = 42365987712. Its totient is φ = 7020416120.

The previous prime is 21122121101. The next prime is 21122121103. The reversal of 21122121102 is 20112122112.

It is an interprime number because it is at equal distance from previous prime (21122121101) and next prime (21122121103).

It is a super-2 number, since 2×21122121102² (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 (21122121101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5070474 + ... + 5074637.

It is an arithmetic number, because the mean of its divisors is an integer number (2647874232).

Almost surely, 2^21122121102 is an apocalyptic number.

21122121102 is an abundant number, since it is smaller than the sum of its proper divisors (21243866610).

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

21122121102 is a wasteful number, since it uses less digits than its factorization.

21122121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10145463.

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

Adding to 21122121102 its reverse (20112122112), we get a palindrome (41234243214).

The spelling of 21122121102 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred two".