21340533774 has 32 divisors (see below), whose sum is σ = 48993267456. Its totient is φ = 6070432320.

The previous prime is 21340533763. The next prime is 21340533779. The reversal of 21340533774 is 47733504312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340533779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1109647 + ... + 1128714.

It is an arithmetic number, because the mean of its divisors is an integer number (1531039608).

Almost surely, 2^21340533774 is an apocalyptic number.

21340533774 is an abundant number, since it is smaller than the sum of its proper divisors (27652733682).

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

21340533774 is a wasteful number, since it uses less digits than its factorization.

21340533774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238600.

The product of its (nonzero) digits is 211680, while the sum is 39.

The spelling of 21340533774 in words is "twenty-one billion, three hundred forty million, five hundred thirty-three thousand, seven hundred seventy-four".