21012120221000 has 64 divisors (see below), whose sum is σ = 49172546292480. Its totient is φ = 8404132708800.

The previous prime is 21012120220999. The next prime is 21012120221011. The reversal of 21012120221000 is 12202121012.

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, 10938689 + ... + 12715311.

It is an arithmetic number, because the mean of its divisors is an integer number (768321035820).

Almost surely, 2^{21012120221000} is an apocalyptic number.

21012120221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012120221000 is an abundant number, since it is smaller than the sum of its proper divisors (28160426071480).

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

21012120221000 is a wasteful number, since it uses less digits than its factorization.

21012120221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788471 (or 1788457 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21012120221000 its reverse (12202121012), we get a palindrome (21024322342012).

The spelling of 21012120221000 in words is "twenty-one trillion, twelve billion, one hundred twenty million, two hundred twenty-one thousand".