21121021210030 has 32 divisors (see below), whose sum is σ = 43543207350720. Its totient is φ = 7225784747520.

The previous prime is 21121021210027. The next prime is 21121021210033. The reversal of 21121021210030 is 3001212012112.

It is an interprime number because it is at equal distance from previous prime (21121021210027) and next prime (21121021210033).

It is a junction number, because it is equal to n+sod(n) for n = 21121021209986 and 21121021210013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121021210033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327222475 + ... + 327287014.

It is an arithmetic number, because the mean of its divisors is an integer number (1360725229710).

Almost surely, 2^{21121021210030} is an apocalyptic number.

21121021210030 is an abundant number, since it is smaller than the sum of its proper divisors (22422186140690).

21121021210030 is a wasteful number, since it uses less digits than its factorization.

21121021210030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654509964.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21121021210030 its reverse (3001212012112), we get a palindrome (24122233222142).

The spelling of 21121021210030 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred ten thousand, thirty".