21798429455 has 16 divisors (see below), whose sum is σ = 28611446400. Its totient is φ = 15811558560.

The previous prime is 21798429379. The next prime is 21798429461. The reversal of 21798429455 is 55492489712.

It is not a de Polignac number, because 21798429455 - 2¹² = 21798425359 is a prime.

It is a super-2 number, since 2×21798429455² (a number of 21 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 21798429455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502025 + ... + 543714.

It is an arithmetic number, because the mean of its divisors is an integer number (1788215400).

Almost surely, 2^21798429455 is an apocalyptic number.

21798429455 is a deficient number, since it is larger than the sum of its proper divisors (6813016945).

21798429455 is a wasteful number, since it uses less digits than its factorization.

21798429455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046134.

The product of its digits is 7257600, while the sum is 56.

The spelling of 21798429455 in words is "twenty-one billion, seven hundred ninety-eight million, four hundred twenty-nine thousand, four hundred fifty-five".