21055233452 has 12 divisors (see below), whose sum is σ = 40196354856. Its totient is φ = 9570560640.

The previous prime is 21055233443. The next prime is 21055233467. The reversal of 21055233452 is 25433255012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239263973 + ... + 239264060.

It is an arithmetic number, because the mean of its divisors is an integer number (3349696238).

Almost surely, 2^21055233452 is an apocalyptic number.

21055233452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21055233452 is a deficient number, since it is larger than the sum of its proper divisors (19141121404).

21055233452 is a wasteful number, since it uses less digits than its factorization.

21055233452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478528048 (or 478528046 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 21055233452 its reverse (25433255012), we get a palindrome (46488488464).

The spelling of 21055233452 in words is "twenty-one billion, fifty-five million, two hundred thirty-three thousand, four hundred fifty-two".