21030121332 has 72 divisors (see below), whose sum is σ = 58809022272. Its totient is φ = 6282998400.

The previous prime is 21030121271. The next prime is 21030121351. The reversal of 21030121332 is 23312103012.

21030121332 is a `hidden beast` number, since 2 + 10 + 301 + 21 + 332 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345873 + ... + 402104.

It is an arithmetic number, because the mean of its divisors is an integer number (816791976).

Almost surely, 2^21030121332 is an apocalyptic number.

21030121332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21030121332 is an abundant number, since it is smaller than the sum of its proper divisors (37778900940).

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

21030121332 is a wasteful number, since it uses less digits than its factorization.

21030121332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748069 (or 748064 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21030121332 its reverse (23312103012), we get a palindrome (44342224344).

The spelling of 21030121332 in words is "twenty-one billion, thirty million, one hundred twenty-one thousand, three hundred thirty-two".