21234261771550 has 48 divisors (see below), whose sum is σ = 40337444041920. Its totient is φ = 8312702658560.

The previous prime is 21234261771533. The next prime is 21234261771551. The reversal of 21234261771550 is 5517716243212.

It is a self number, because there is not a number n which added to its sum of digits gives 21234261771550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234261771551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76492602 + ... + 76769698.

It is an arithmetic number, because the mean of its divisors is an integer number (840363417540).

Almost surely, 2^{21234261771550} is an apocalyptic number.

21234261771550 is a deficient number, since it is larger than the sum of its proper divisors (19103182270370).

21234261771550 is a wasteful number, since it uses less digits than its factorization.

21234261771550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309765 (or 309760 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 46.

The spelling of 21234261771550 in words is "twenty-one trillion, two hundred thirty-four billion, two hundred sixty-one million, seven hundred seventy-one thousand, five hundred fifty".