1421521311 has 16 divisors (see below), whose sum is σ = 2210336000. Its totient is φ = 812297304.

The previous prime is 1421521303. The next prime is 1421521319. The reversal of 1421521311 is 1131251241.

It is an interprime number because it is at equal distance from previous prime (1421521303) and next prime (1421521319).

It is not a de Polignac number, because 1421521311 - 2³ = 1421521303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421521319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689701 + ... + 691758.

It is an arithmetic number, because the mean of its divisors is an integer number (138146000).

Almost surely, 2^1421521311 is an apocalyptic number.

1421521311 is a deficient number, since it is larger than the sum of its proper divisors (788814689).

1421521311 is an equidigital number, since it uses as much as digits as its factorization.

1421521311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381483 (or 1381469 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 1421521311 is about 37703.0676603377. The cubic root of 1421521311 is about 1124.3921156433.

Adding to 1421521311 its reverse (1131251241), we get a palindrome (2552772552).

The spelling of 1421521311 in words is "one billion, four hundred twenty-one million, five hundred twenty-one thousand, three hundred eleven".