21555420154213 has 8 divisors (see below), whose sum is σ = 23515044045696. Its totient is φ = 19595802969600.

The previous prime is 21555420154211. The next prime is 21555420154253. The reversal of 21555420154213 is 31245102455512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21555420154213 - 2¹ = 21555420154211 is a prime.

It is a super-2 number, since 2×21555420154213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21555420154211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6991908 + ... + 9591538.

It is an arithmetic number, because the mean of its divisors is an integer number (2939380505712).

Almost surely, 2^{21555420154213} is an apocalyptic number.

It is an amenable number.

21555420154213 is a deficient number, since it is larger than the sum of its proper divisors (1959623891483).

21555420154213 is a wasteful number, since it uses less digits than its factorization.

21555420154213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353435.

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 21555420154213 in words is "twenty-one trillion, five hundred fifty-five billion, four hundred twenty million, one hundred fifty-four thousand, two hundred thirteen".