21121023030 has 16 divisors (see below), whose sum is σ = 50690455344. Its totient is φ = 5632272800.

The previous prime is 21121022971. The next prime is 21121023037. The reversal of 21121023030 is 3032012112.

It is a super-2 number, since 2×21121023030² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121023037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352017021 + ... + 352017080.

It is an arithmetic number, because the mean of its divisors is an integer number (3168153459).

Almost surely, 2^21121023030 is an apocalyptic number.

21121023030 is an abundant number, since it is smaller than the sum of its proper divisors (29569432314).

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

21121023030 is a wasteful number, since it uses less digits than its factorization.

21121023030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704034111.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21121023030 its reverse (3032012112), we get a palindrome (24153035142).

The spelling of 21121023030 in words is "twenty-one billion, one hundred twenty-one million, twenty-three thousand, thirty".