20213021401 has 4 divisors (see below), whose sum is σ = 20301288100. Its totient is φ = 20124754704.

The previous prime is 20213021399. The next prime is 20213021407. The reversal of 20213021401 is 10412031202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10412031202 = 2 ⋅5206015601.

It can be written as a sum of positive squares in 2 ways, for example, as 10562906176 + 9650115225 = 102776^2 + 98235^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213021401 - 2¹ = 20213021399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213021407) 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, 44133006 + ... + 44133463.

It is an arithmetic number, because the mean of its divisors is an integer number (5075322025).

Almost surely, 2^20213021401 is an apocalyptic number.

It is an amenable number.

20213021401 is a deficient number, since it is larger than the sum of its proper divisors (88266699).

20213021401 is an equidigital number, since it uses as much as digits as its factorization.

20213021401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88266698.

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

Adding to 20213021401 its reverse (10412031202), we get a palindrome (30625052603).

The spelling of 20213021401 in words is "twenty billion, two hundred thirteen million, twenty-one thousand, four hundred one".