21798429454 has 16 divisors (see below), whose sum is σ = 34150546800. Its totient is φ = 10424899584.

The previous prime is 21798429379. The next prime is 21798429461. The reversal of 21798429454 is 45492489712.

It is a super-2 number, since 2×21798429454² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21798429395 and 21798429404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2492019 + ... + 2500750.

It is an arithmetic number, because the mean of its divisors is an integer number (2134409175).

Almost surely, 2^21798429454 is an apocalyptic number.

21798429454 is a deficient number, since it is larger than the sum of its proper divisors (12352117346).

21798429454 is a wasteful number, since it uses less digits than its factorization.

21798429454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992867.

The product of its digits is 5806080, while the sum is 55.

The spelling of 21798429454 in words is "twenty-one billion, seven hundred ninety-eight million, four hundred twenty-nine thousand, four hundred fifty-four".