21548142069 has 16 divisors (see below), whose sum is σ = 29415008832. Its totient is φ = 14023715328.

The previous prime is 21548142061. The next prime is 21548142113. The reversal of 21548142069 is 96024184512.

It is not a de Polignac number, because 21548142069 - 2³ = 21548142061 is a prime.

It is a super-2 number, since 2×21548142069² (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 21548142069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21548142061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197637 + ... + 286629.

It is an arithmetic number, because the mean of its divisors is an integer number (1838438052).

Almost surely, 2^21548142069 is an apocalyptic number.

It is an amenable number.

21548142069 is a deficient number, since it is larger than the sum of its proper divisors (7866866763).

21548142069 is a wasteful number, since it uses less digits than its factorization.

21548142069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90916.

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 21548142069 in words is "twenty-one billion, five hundred forty-eight million, one hundred forty-two thousand, sixty-nine".