1351445440021 has 16 divisors (see below), whose sum is σ = 1422634636800. Its totient is φ = 1282469284800.

The previous prime is 1351445439923. The next prime is 1351445440043. The reversal of 1351445440021 is 1200445441531.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1351445440021 - 2¹³ = 1351445431829 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 (1351445440091) 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, 2448421 + ... + 2949178.

It is an arithmetic number, because the mean of its divisors is an integer number (88914664800).

Almost surely, 2^{1351445440021} is an apocalyptic number.

It is an amenable number.

1351445440021 is a deficient number, since it is larger than the sum of its proper divisors (71189196779).

1351445440021 is a wasteful number, since it uses less digits than its factorization.

1351445440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5397804.

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 1351445440021 in words is "one trillion, three hundred fifty-one billion, four hundred forty-five million, four hundred forty thousand, twenty-one".