21287207954 has 32 divisors (see below), whose sum is σ = 34542668160. Its totient is φ = 9805622400.

The previous prime is 21287207939. The next prime is 21287207957. The reversal of 21287207954 is 45970278212.

21287207954 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21287207954² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21287207899 and 21287207908.

It is not an unprimeable number, because it can be changed into a prime (21287207957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462572 + ... + 506504.

It is an arithmetic number, because the mean of its divisors is an integer number (1079458380).

Almost surely, 2^21287207954 is an apocalyptic number.

21287207954 is a deficient number, since it is larger than the sum of its proper divisors (13255460206).

21287207954 is a wasteful number, since it uses less digits than its factorization.

21287207954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44306.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 21287207954 in words is "twenty-one billion, two hundred eighty-seven million, two hundred seven thousand, nine hundred fifty-four".