21141358728550 has 24 divisors (see below), whose sum is σ = 40678890246000. Its totient is φ = 8164938542880.

The previous prime is 21141358728547. The next prime is 21141358728557. The reversal of 21141358728550 is 5582785314112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21141358728557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7290122250 + ... + 7290125149.

It is an arithmetic number, because the mean of its divisors is an integer number (1694953760250).

Almost surely, 2^{21141358728550} is an apocalyptic number.

21141358728550 is a deficient number, since it is larger than the sum of its proper divisors (19537531517450).

21141358728550 is a wasteful number, since it uses less digits than its factorization.

21141358728550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14580247440 (or 14580247435 counting only the distinct ones).

The product of its (nonzero) digits is 2688000, while the sum is 52.

The spelling of 21141358728550 in words is "twenty-one trillion, one hundred forty-one billion, three hundred fifty-eight million, seven hundred twenty-eight thousand, five hundred fifty".