21121300102 has 16 divisors (see below), whose sum is σ = 36279090720. Its totient is φ = 9034198848.

The previous prime is 21121300073. The next prime is 21121300103. The reversal of 21121300102 is 20100312112.

It is a super-2 number, since 2×21121300102² (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 (21121300103) 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, 1474863 + ... + 1489114.

It is an arithmetic number, because the mean of its divisors is an integer number (2267443170).

Almost surely, 2^21121300102 is an apocalyptic number.

21121300102 is a deficient number, since it is larger than the sum of its proper divisors (15157790618).

21121300102 is a wasteful number, since it uses less digits than its factorization.

21121300102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964495.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21121300102 its reverse (20100312112), we get a palindrome (41221612214).

The spelling of 21121300102 in words is "twenty-one billion, one hundred twenty-one million, three hundred thousand, one hundred two".