21331211001000 has 64 divisors (see below), whose sum is σ = 66553378332480. Its totient is φ = 5688322932800.

The previous prime is 21331211000977. The next prime is 21331211001059. The reversal of 21331211001000 is 10011213312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3555198834 + ... + 3555204833.

It is an arithmetic number, because the mean of its divisors is an integer number (1039896536445).

Almost surely, 2^{21331211001000} is an apocalyptic number.

21331211001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331211001000 is an abundant number, since it is smaller than the sum of its proper divisors (45222167331480).

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

21331211001000 is a wasteful number, since it uses less digits than its factorization.

21331211001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110403691 (or 7110403677 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21331211001000 its reverse (10011213312), we get a palindrome (21341222214312).

The spelling of 21331211001000 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred eleven million, one thousand".