10401020021 has 4 divisors (see below), whose sum is σ = 11886880032. Its totient is φ = 8915160012.

The previous prime is 10401020011. The next prime is 10401020023. The reversal of 10401020021 is 12002010401.

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: 12002010401 = 41 ⋅292731961.

It is a cyclic number.

It is not a de Polignac number, because 10401020021 - 2²² = 10396825717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10401019984 and 10401020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10401020023) 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, 742929995 + ... + 742930008.

It is an arithmetic number, because the mean of its divisors is an integer number (2971720008).

Almost surely, 2^10401020021 is an apocalyptic number.

It is an amenable number.

10401020021 is a deficient number, since it is larger than the sum of its proper divisors (1485860011).

10401020021 is an equidigital number, since it uses as much as digits as its factorization.

10401020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485860010.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10401020021 its reverse (12002010401), we get a palindrome (22403030422).

The spelling of 10401020021 in words is "ten billion, four hundred one million, twenty thousand, twenty-one".