21154520613430 has 16 divisors (see below), whose sum is σ = 38080285211520. Its totient is φ = 8461330888192.

The previous prime is 21154520613407. The next prime is 21154520613439. The reversal of 21154520613430 is 3431602545112.

It is a super-3 number, since 3×21154520613430³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21154520613430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154520613439) 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, 59483494 + ... + 59838073.

It is an arithmetic number, because the mean of its divisors is an integer number (2380017825720).

Almost surely, 2^{21154520613430} is an apocalyptic number.

21154520613430 is a deficient number, since it is larger than the sum of its proper divisors (16925764598090).

21154520613430 is a wasteful number, since it uses less digits than its factorization.

21154520613430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119339303.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 21154520613430 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred twenty million, six hundred thirteen thousand, four hundred thirty".