21022001221210 has 32 divisors (see below), whose sum is σ = 43707775804992. Its totient is φ = 7194695604480.

The previous prime is 21022001221187. The next prime is 21022001221211. The reversal of 21022001221210 is 1212210022012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21022001221211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5620854072 + ... + 5620857811.

It is an arithmetic number, because the mean of its divisors is an integer number (1365867993906).

Almost surely, 2^{21022001221210} is an apocalyptic number.

21022001221210 is an abundant number, since it is smaller than the sum of its proper divisors (22685774583782).

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

21022001221210 is a wasteful number, since it uses less digits than its factorization.

21022001221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11241711918.

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

Adding to 21022001221210 its reverse (1212210022012), we get a palindrome (22234211243222).

The spelling of 21022001221210 in words is "twenty-one trillion, twenty-two billion, one million, two hundred twenty-one thousand, two hundred ten".