1351051021 has 4 divisors (see below), whose sum is σ = 1394633344. Its totient is φ = 1307468700.

The previous prime is 1351051007. The next prime is 1351051057. The reversal of 1351051021 is 1201501531.

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 1351051021 - 2²¹ = 1348953869 is a prime.

It is a super-2 number, since 2×1351051021² = 3650677722690284882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1351051021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351051001) 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, 21791115 + ... + 21791176.

It is an arithmetic number, because the mean of its divisors is an integer number (348658336).

Almost surely, 2^1351051021 is an apocalyptic number.

It is an amenable number.

1351051021 is a deficient number, since it is larger than the sum of its proper divisors (43582323).

1351051021 is an equidigital number, since it uses as much as digits as its factorization.

1351051021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43582322.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1351051021 is about 36756.6459432849. The cubic root of 1351051021 is about 1105.4961895979.

Adding to 1351051021 its reverse (1201501531), we get a palindrome (2552552552).

The spelling of 1351051021 in words is "one billion, three hundred fifty-one million, fifty-one thousand, twenty-one".