21020032221321 has 16 divisors (see below), whose sum is σ = 32046453014528. Its totient is φ = 12005474086800.

The previous prime is 21020032221277. The next prime is 21020032221347. The reversal of 21020032221321 is 12312223002012.

It is not a de Polignac number, because 21020032221321 - 2⁶ = 21020032221257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020032221121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248827465 + ... + 248911926.

It is an arithmetic number, because the mean of its divisors is an integer number (2002903313408).

Almost surely, 2^{21020032221321} is an apocalyptic number.

21020032221321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21020032221321 is a deficient number, since it is larger than the sum of its proper divisors (11026420793207).

21020032221321 is a wasteful number, since it uses less digits than its factorization.

21020032221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497741412.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21020032221321 its reverse (12312223002012), we get a palindrome (33332255223333).

The spelling of 21020032221321 in words is "twenty-one trillion, twenty billion, thirty-two million, two hundred twenty-one thousand, three hundred twenty-one".