21477406842 has 48 divisors (see below), whose sum is σ = 47165976000. Its totient is φ = 7062340032.

The previous prime is 21477406801. The next prime is 21477406843. The reversal of 21477406842 is 24860477412.

It is a super-2 number, since 2×21477406842² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21477406843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 688009 + ... + 718547.

It is an arithmetic number, because the mean of its divisors is an integer number (982624500).

Almost surely, 2^21477406842 is an apocalyptic number.

21477406842 is an abundant number, since it is smaller than the sum of its proper divisors (25688569158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21477406842 is a wasteful number, since it uses less digits than its factorization.

21477406842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31075 (or 31072 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 45.

The spelling of 21477406842 in words is "twenty-one billion, four hundred seventy-seven million, four hundred six thousand, eight hundred forty-two".