21554210352 has 40 divisors (see below), whose sum is σ = 55686983920. Its totient is φ = 7184056320.

The previous prime is 21554210351. The next prime is 21554210477. The reversal of 21554210352 is 25301245512.

It is not an unprimeable number, because it can be changed into a prime (21554210351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 923952 + ... + 946992.

It is an arithmetic number, because the mean of its divisors is an integer number (1392174598).

Almost surely, 2^21554210352 is an apocalyptic number.

It is an amenable number.

21554210352 is an abundant number, since it is smaller than the sum of its proper divisors (34132773568).

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

21554210352 is a wasteful number, since it uses less digits than its factorization.

21554210352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42541 (or 42535 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21554210352 its reverse (25301245512), we get a palindrome (46855455864).

The spelling of 21554210352 in words is "twenty-one billion, five hundred fifty-four million, two hundred ten thousand, three hundred fifty-two".