21474815541554 has 8 divisors (see below), whose sum is σ = 33082823942508. Its totient is φ = 10447207560720.

The previous prime is 21474815541511. The next prime is 21474815541563. The reversal of 21474815541554 is 45514551847412.

It can be written as a sum of positive squares in 2 ways, for example, as 21262916435929 + 211899105625 = 4611173^2 + 460325^2 .

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

It is a super-2 number, since 2×21474815541554² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21474815541554.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145100104937 + ... + 145100105084.

Almost surely, 2^{21474815541554} is an apocalyptic number.

21474815541554 is a deficient number, since it is larger than the sum of its proper divisors (11608008400954).

21474815541554 is a wasteful number, since it uses less digits than its factorization.

21474815541554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290200210060.

The product of its digits is 17920000, while the sum is 56.

The spelling of 21474815541554 in words is "twenty-one trillion, four hundred seventy-four billion, eight hundred fifteen million, five hundred forty-one thousand, five hundred fifty-four".