21145031539580 has 72 divisors (see below), whose sum is σ = 50613738058800. Its totient is φ = 7396480645632.

The previous prime is 21145031539573. The next prime is 21145031539613. The reversal of 21145031539580 is 8593513054112.

It is a super-2 number, since 2×21145031539580² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164565425 + ... + 164693864.

It is an arithmetic number, because the mean of its divisors is an integer number (702968584150).

Almost surely, 2^{21145031539580} is an apocalyptic number.

21145031539580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21145031539580 is an abundant number, since it is smaller than the sum of its proper divisors (29468706519220).

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

21145031539580 is a wasteful number, since it uses less digits than its factorization.

21145031539580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329259343 (or 329259328 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 47.

The spelling of 21145031539580 in words is "twenty-one trillion, one hundred forty-five billion, thirty-one million, five hundred thirty-nine thousand, five hundred eighty".