21231433401000 has 128 divisors (see below), whose sum is σ = 66345419986560. Its totient is φ = 5652882432000.

The previous prime is 21231433400917. The next prime is 21231433401019. The reversal of 21231433401000 is 10433413212.

It is a happy number.

It is a super-2 number, since 2×21231433401000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3597394 + ... + 7443393.

It is an arithmetic number, because the mean of its divisors is an integer number (518323593645).

Almost surely, 2^{21231433401000} is an apocalyptic number.

21231433401000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231433401000 is an abundant number, since it is smaller than the sum of its proper divisors (45113986585560).

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

21231433401000 is a wasteful number, since it uses less digits than its factorization.

21231433401000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11041452 (or 11041438 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21231433401000 its reverse (10433413212), we get a palindrome (21241866814212).

The spelling of 21231433401000 in words is "twenty-one trillion, two hundred thirty-one billion, four hundred thirty-three million, four hundred one thousand".