21121201430 has 64 divisors (see below), whose sum is σ = 44018432640. Its totient is φ = 7147008000.

The previous prime is 21121201417. The next prime is 21121201487. The reversal of 21121201430 is 3410212112.

It is a super-2 number, since 2×21121201430² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121201399 and 21121201408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3741410 + ... + 3747050.

It is an arithmetic number, because the mean of its divisors is an integer number (687788010).

Almost surely, 2^21121201430 is an apocalyptic number.

21121201430 is an abundant number, since it is smaller than the sum of its proper divisors (22897231210).

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

21121201430 is a wasteful number, since it uses less digits than its factorization.

21121201430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6345.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21121201430 its reverse (3410212112), we get a palindrome (24531413542).

The spelling of 21121201430 in words is "twenty-one billion, one hundred twenty-one million, two hundred one thousand, four hundred thirty".