21121213030 has 32 divisors (see below), whose sum is σ = 39680160768. Its totient is φ = 8079324000.

The previous prime is 21121213027. The next prime is 21121213031. The reversal of 21121213030 is 3031212112.

It is a super-2 number, since 2×21121213030² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121212995 and 21121213013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121213031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1444255 + ... + 1458805.

It is an arithmetic number, because the mean of its divisors is an integer number (1240005024).

Almost surely, 2^21121213030 is an apocalyptic number.

21121213030 is a deficient number, since it is larger than the sum of its proper divisors (18558947738).

21121213030 is a wasteful number, since it uses less digits than its factorization.

21121213030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20892.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21121213030 its reverse (3031212112), we get a palindrome (24152425142).

The spelling of 21121213030 in words is "twenty-one billion, one hundred twenty-one million, two hundred thirteen thousand, thirty".