20273002021 has 4 divisors (see below), whose sum is σ = 20302684992. Its totient is φ = 20243319052.

The previous prime is 20273001967. The next prime is 20273002031. The reversal of 20273002021 is 12020037202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12020037202 = 2 ⋅6010018601.

It is a cyclic number.

It is not a de Polignac number, because 20273002021 - 2¹¹ = 20272999973 is a prime.

It is a super-2 number, since 2×20273002021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20273002021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20273002031) 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, 14840461 + ... + 14841826.

It is an arithmetic number, because the mean of its divisors is an integer number (5075671248).

Almost surely, 2^20273002021 is an apocalyptic number.

It is an amenable number.

20273002021 is a deficient number, since it is larger than the sum of its proper divisors (29682971).

20273002021 is an equidigital number, since it uses as much as digits as its factorization.

20273002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29682970.

The product of its (nonzero) digits is 336, while the sum is 19.

Adding to 20273002021 its reverse (12020037202), we get a palindrome (32293039223).

The spelling of 20273002021 in words is "twenty billion, two hundred seventy-three million, two thousand, twenty-one".