21221022212010 has 64 divisors (see below), whose sum is σ = 57969621682560. Its totient is φ = 5520916344960.

The previous prime is 21221022211993. The next prime is 21221022212017. The reversal of 21221022212010 is 1021222012212.

It is a happy number.

21221022212010 is a `hidden beast` number, since 21 + 221 + 0 + 2 + 221 + 201 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21221022212017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 958481352 + ... + 958503491.

It is an arithmetic number, because the mean of its divisors is an integer number (905775338790).

Almost surely, 2^{21221022212010} is an apocalyptic number.

21221022212010 is an abundant number, since it is smaller than the sum of its proper divisors (36748599470550).

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

21221022212010 is a wasteful number, since it uses less digits than its factorization.

21221022212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916984900 (or 1916984894 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221022212010 its reverse (1021222012212), we get a palindrome (22242244224222).

The spelling of 21221022212010 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two million, two hundred twelve thousand, ten".