20321121032021 has 16 divisors (see below), whose sum is σ = 22204624104960. Its totient is φ = 18545907562560.

The previous prime is 20321121031919. The next prime is 20321121032029. The reversal of 20321121032021 is 12023012112302.

It is a cyclic number.

It is not a de Polignac number, because 20321121032021 - 2³⁴ = 20303941162837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20321121031984 and 20321121032002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321121032029) 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, 262800170 + ... + 262877483.

It is an arithmetic number, because the mean of its divisors is an integer number (1387789006560).

Almost surely, 2^{20321121032021} is an apocalyptic number.

It is an amenable number.

20321121032021 is a deficient number, since it is larger than the sum of its proper divisors (1883503072939).

20321121032021 is a wasteful number, since it uses less digits than its factorization.

20321121032021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525677756.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20321121032021 its reverse (12023012112302), we get a palindrome (32344133144323).

The spelling of 20321121032021 in words is "twenty trillion, three hundred twenty-one billion, one hundred twenty-one million, thirty-two thousand, twenty-one".