20010145421 has 4 divisors (see below), whose sum is σ = 22868737632. Its totient is φ = 17151553212.

The previous prime is 20010145411. The next prime is 20010145447. The reversal of 20010145421 is 12454101002.

It is a happy number.

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 20010145421 - 2¹⁰ = 20010144397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010145393 and 20010145402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010145411) 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, 1429296095 + ... + 1429296108.

It is an arithmetic number, because the mean of its divisors is an integer number (5717184408).

Almost surely, 2^20010145421 is an apocalyptic number.

It is an amenable number.

20010145421 is a deficient number, since it is larger than the sum of its proper divisors (2858592211).

20010145421 is an equidigital number, since it uses as much as digits as its factorization.

20010145421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858592210.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 20010145421 its reverse (12454101002), we get a palindrome (32464246423).

The spelling of 20010145421 in words is "twenty billion, ten million, one hundred forty-five thousand, four hundred twenty-one".