23011020421 has 4 divisors (see below), whose sum is σ = 23055019072. Its totient is φ = 22967021772.

The previous prime is 23011020407. The next prime is 23011020433. The reversal of 23011020421 is 12402011032.

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 23011020421 - 2¹³ = 23011012229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23011020395 and 23011020404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23011027421) 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, 21998541 + ... + 21999586.

It is an arithmetic number, because the mean of its divisors is an integer number (5763754768).

Almost surely, 2^23011020421 is an apocalyptic number.

It is an amenable number.

23011020421 is a deficient number, since it is larger than the sum of its proper divisors (43998651).

23011020421 is an equidigital number, since it uses as much as digits as its factorization.

23011020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43998650.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 23011020421 its reverse (12402011032), we get a palindrome (35413031453).

The spelling of 23011020421 in words is "twenty-three billion, eleven million, twenty thousand, four hundred twenty-one".