21022021211200 has 42 divisors (see below), whose sum is σ = 51727310946746. Its totient is φ = 8408808483840.

The previous prime is 21022021211197. The next prime is 21022021211203. The reversal of 21022021211200 is 211212022012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21022021211197) and next prime (21022021211203).

It can be written as a sum of positive squares in 3 ways, for example, as 4015502992384 + 17006518218816 = 2003872^2 + 4123896^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21022021211203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6569380029 + ... + 6569383228.

Almost surely, 2^{21022021211200} is an apocalyptic number.

21022021211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022021211200 is an abundant number, since it is smaller than the sum of its proper divisors (30705289735546).

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

21022021211200 is a wasteful number, since it uses less digits than its factorization.

21022021211200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13138763279 (or 13138763264 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21022021211200 its reverse (211212022012), we get a palindrome (21233233233212).

The spelling of 21022021211200 in words is "twenty-one trillion, twenty-two billion, twenty-one million, two hundred eleven thousand, two hundred".