21434878036 has 96 divisors (see below), whose sum is σ = 45704026368. Its totient is φ = 8664744960.

The previous prime is 21434878019. The next prime is 21434878039. The reversal of 21434878036 is 63087843412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434878039) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2174976 + ... + 2184808.

It is an arithmetic number, because the mean of its divisors is an integer number (476083608).

Almost surely, 2^21434878036 is an apocalyptic number.

21434878036 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21434878036 is an abundant number, since it is smaller than the sum of its proper divisors (24269148332).

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

21434878036 is a wasteful number, since it uses less digits than its factorization.

21434878036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10001 (or 9999 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 21434878036 in words is "twenty-one billion, four hundred thirty-four million, eight hundred seventy-eight thousand, thirty-six".