1355404506021 has 6 divisors (see below), whose sum is σ = 1957806508710. Its totient is φ = 903603004008.

The previous prime is 1355404505999. The next prime is 1355404506041. The reversal of 1355404506021 is 1206054045531.

1355404506021 is a `hidden beast` number, since 1 + 3 + 5 + 5 + 4 + 0 + 45 + 0 + 602 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 712481175396 + 642923330625 = 844086^2 + 801825^2 .

It is not a de Polignac number, because 1355404506021 - 2⁹ = 1355404505509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355404506041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75300250326 + ... + 75300250343.

It is an arithmetic number, because the mean of its divisors is an integer number (326301084785).

Almost surely, 2^{1355404506021} is an apocalyptic number.

It is an amenable number.

1355404506021 is a deficient number, since it is larger than the sum of its proper divisors (602402002689).

1355404506021 is a wasteful number, since it uses less digits than its factorization.

1355404506021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150600500675 (or 150600500672 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 1355404506021 in words is "one trillion, three hundred fifty-five billion, four hundred four million, five hundred six thousand, twenty-one".