21436731948 has 48 divisors (see below), whose sum is σ = 50245875680. Its totient is φ = 7113222144.

The previous prime is 21436731947. The next prime is 21436732027. The reversal of 21436731948 is 84913763412.

It is a super-2 number, since 2×21436731948² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21436731897 and 21436731906.

It is not an unprimeable number, because it can be changed into a prime (21436731947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4747740 + ... + 4752252.

Almost surely, 2^21436731948 is an apocalyptic number.

It is an amenable number.

21436731948 is an abundant number, since it is smaller than the sum of its proper divisors (28809143732).

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

21436731948 is a wasteful number, since it uses less digits than its factorization.

21436731948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226 (or 6224 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The spelling of 21436731948 in words is "twenty-one billion, four hundred thirty-six million, seven hundred thirty-one thousand, nine hundred forty-eight".