21155141320432 has 60 divisors (see below), whose sum is σ = 47680712662440. Its totient is φ = 9066357191808.

The previous prime is 21155141320429. The next prime is 21155141320451. The reversal of 21155141320432 is 23402314155112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69458623 + ... + 69762529.

It is an arithmetic number, because the mean of its divisors is an integer number (794678544374).

Almost surely, 2^{21155141320432} is an apocalyptic number.

It is an amenable number.

21155141320432 is an abundant number, since it is smaller than the sum of its proper divisors (26525571342008).

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

21155141320432 is a wasteful number, since it uses less digits than its factorization.

21155141320432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392718 (or 392705 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 21155141320432 its reverse (23402314155112), we get a palindrome (44557455475544).

The spelling of 21155141320432 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-one million, three hundred twenty thousand, four hundred thirty-two".