21121400312430 has 32 divisors (see below), whose sum is σ = 55299666273408. Its totient is φ = 5120339469600.

The previous prime is 21121400312401. The next prime is 21121400312443. The reversal of 21121400312430 is 3421300412112.

It is a super-2 number, since 2×21121400312430² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121400312430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32002121356 + ... + 32002122015.

It is an arithmetic number, because the mean of its divisors is an integer number (1728114571044).

Almost surely, 2^{21121400312430} is an apocalyptic number.

21121400312430 is an abundant number, since it is smaller than the sum of its proper divisors (34178265960978).

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

21121400312430 is a wasteful number, since it uses less digits than its factorization.

21121400312430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64004243392.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21121400312430 its reverse (3421300412112), we get a palindrome (24542700724542).

The spelling of 21121400312430 in words is "twenty-one trillion, one hundred twenty-one billion, four hundred million, three hundred twelve thousand, four hundred thirty".