21354545436049 has 16 divisors (see below), whose sum is σ = 24782266469248. Its totient is φ = 18021375009792.

The previous prime is 21354545436023. The next prime is 21354545436143. The reversal of 21354545436049 is 94063454545312.

It is not a de Polignac number, because 21354545436049 - 2⁵ = 21354545436017 is a prime.

It is a super-2 number, since 2×21354545436049² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21354545436449) 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, 10870992 + ... + 12684145.

It is an arithmetic number, because the mean of its divisors is an integer number (1548891654328).

Almost surely, 2^{21354545436049} is an apocalyptic number.

It is an amenable number.

21354545436049 is a deficient number, since it is larger than the sum of its proper divisors (3427721033199).

21354545436049 is a wasteful number, since it uses less digits than its factorization.

21354545436049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23557144.

The product of its (nonzero) digits is 31104000, while the sum is 55.

The spelling of 21354545436049 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred forty-five million, four hundred thirty-six thousand, forty-nine".