21022000212120 has 32 divisors (see below), whose sum is σ = 63066000636720. Its totient is φ = 5605866723200.

The previous prime is 21022000212113. The next prime is 21022000212127. The reversal of 21022000212120 is 2121200022012.

It is an interprime number because it is at equal distance from previous prime (21022000212113) and next prime (21022000212127).

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

It is a self number, because there is not a number n which added to its sum of digits gives 21022000212120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022000212127) 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, 87591667431 + ... + 87591667670.

Almost surely, 2^{21022000212120} is an apocalyptic number.

21022000212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022000212120 is an abundant number, since it is smaller than the sum of its proper divisors (42044000424600).

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

21022000212120 is a wasteful number, since it uses less digits than its factorization.

21022000212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175183335115 (or 175183335111 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21022000212120 its reverse (2121200022012), we get a palindrome (23143200234132).

The spelling of 21022000212120 in words is "twenty-one trillion, twenty-two billion, two hundred twelve thousand, one hundred twenty".