1301400021 has 4 divisors (see below), whose sum is σ = 1735200032. Its totient is φ = 867600012.

The previous prime is 1301400017. The next prime is 1301400043. The reversal of 1301400021 is 1200041031.

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 not a de Polignac number, because 1301400021 - 2² = 1301400017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301400521) 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, 216900001 + ... + 216900006.

It is an arithmetic number, because the mean of its divisors is an integer number (433800008).

Almost surely, 2^1301400021 is an apocalyptic number.

It is an amenable number.

1301400021 is a deficient number, since it is larger than the sum of its proper divisors (433800011).

1301400021 is an equidigital number, since it uses as much as digits as its factorization.

1301400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433800010.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1301400021 is about 36074.9223283987. The cubic root of 1301400021 is about 1091.7845304386.

Adding to 1301400021 its reverse (1200041031), we get a palindrome (2501441052).

The spelling of 1301400021 in words is "one billion, three hundred one million, four hundred thousand, twenty-one".