21554610631001 has 16 divisors (see below), whose sum is σ = 24694654817280. Its totient is φ = 18429772112640.

The previous prime is 21554610630991. The next prime is 21554610631061. The reversal of 21554610631001 is 10013601645512.

It is not a de Polignac number, because 21554610631001 - 2¹⁰ = 21554610629977 is a prime.

It is a super-2 number, since 2×21554610631001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21554610631061) 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 15 ways as a sum of consecutive naturals, for example, 196825181 + ... + 196934661.

It is an arithmetic number, because the mean of its divisors is an integer number (1543415926080).

Almost surely, 2^{21554610631001} is an apocalyptic number.

It is an amenable number.

21554610631001 is a deficient number, since it is larger than the sum of its proper divisors (3140044186279).

21554610631001 is a wasteful number, since it uses less digits than its factorization.

21554610631001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178664.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 21554610631001 in words is "twenty-one trillion, five hundred fifty-four billion, six hundred ten million, six hundred thirty-one thousand, one".