21003132021 has 8 divisors (see below), whose sum is σ = 28208586624. Its totient is φ = 13899882720.

The previous prime is 21003131969. The next prime is 21003132037. The reversal of 21003132021 is 12023130012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21003132021 - 2⁶ = 21003131957 is a prime.

It is a super-2 number, since 2×21003132021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003132041) 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, 25550845 + ... + 25551666.

It is an arithmetic number, because the mean of its divisors is an integer number (3526073328).

Almost surely, 2^21003132021 is an apocalyptic number.

It is an amenable number.

21003132021 is a deficient number, since it is larger than the sum of its proper divisors (7205454603).

21003132021 is a wasteful number, since it uses less digits than its factorization.

21003132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51102651.

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

Adding to 21003132021 its reverse (12023130012), we get a palindrome (33026262033).

The spelling of 21003132021 in words is "twenty-one billion, three million, one hundred thirty-two thousand, twenty-one".