20021232101021 has 4 divisors (see below), whose sum is σ = 20021251102944. Its totient is φ = 20021213099100.

The previous prime is 20021232100949. The next prime is 20021232101027. The reversal of 20021232101021 is 12010123212002.

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 a cyclic number.

It is not a de Polignac number, because 20021232101021 - 2³⁰ = 20020158359197 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 (20021232101027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7821545 + ... + 10060766.

It is an arithmetic number, because the mean of its divisors is an integer number (5005312775736).

Almost surely, 2^{20021232101021} is an apocalyptic number.

It is an amenable number.

20021232101021 is a deficient number, since it is larger than the sum of its proper divisors (19001923).

20021232101021 is a wasteful number, since it uses less digits than its factorization.

20021232101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19001922.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20021232101021 its reverse (12010123212002), we get a palindrome (32031355313023).

The spelling of 20021232101021 in words is "twenty trillion, twenty-one billion, two hundred thirty-two million, one hundred one thousand, twenty-one".