21146336140 has 24 divisors (see below), whose sum is σ = 46744533360. Its totient is φ = 8013348288.

The previous prime is 21146336093. The next prime is 21146336147. The reversal of 21146336140 is 4163364112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21146336147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27823747 + ... + 27824506.

It is an arithmetic number, because the mean of its divisors is an integer number (1947688890).

Almost surely, 2^21146336140 is an apocalyptic number.

21146336140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21146336140 is an abundant number, since it is smaller than the sum of its proper divisors (25598197220).

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

21146336140 is a wasteful number, since it uses less digits than its factorization.

21146336140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55648281 (or 55648279 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 21146336140 in words is "twenty-one billion, one hundred forty-six million, three hundred thirty-six thousand, one hundred forty".