21032130123021 has 4 divisors (see below), whose sum is σ = 28042840164032. Its totient is φ = 14021420082012.

The previous prime is 21032130122999. The next prime is 21032130123029. The reversal of 21032130123021 is 12032103123012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21032130123021 - 2¹³ = 21032130114829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032130123029) 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 3 ways as a sum of consecutive naturals, for example, 3505355020501 + ... + 3505355020506.

It is an arithmetic number, because the mean of its divisors is an integer number (7010710041008).

Almost surely, 2^{21032130123021} is an apocalyptic number.

It is an amenable number.

21032130123021 is a deficient number, since it is larger than the sum of its proper divisors (7010710041011).

21032130123021 is an equidigital number, since it uses as much as digits as its factorization.

21032130123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7010710041010.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21032130123021 its reverse (12032103123012), we get a palindrome (33064233246033).

The spelling of 21032130123021 in words is "twenty-one trillion, thirty-two billion, one hundred thirty million, one hundred twenty-three thousand, twenty-one".