21221201202010 has 32 divisors (see below), whose sum is σ = 39516073171200. Its totient is φ = 8195622227520.

The previous prime is 21221201202007. The next prime is 21221201202013. The reversal of 21221201202010 is 1020210212212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21221201202007) and next prime (21221201202013).

It is not an unprimeable number, because it can be changed into a prime (21221201202013) 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, 15658725 + ... + 16959895.

It is an arithmetic number, because the mean of its divisors is an integer number (1234877286600).

Almost surely, 2^{21221201202010} is an apocalyptic number.

21221201202010 is a deficient number, since it is larger than the sum of its proper divisors (18294871969190).

21221201202010 is a wasteful number, since it uses less digits than its factorization.

21221201202010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357446.

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

Adding to 21221201202010 its reverse (1020210212212), we get a palindrome (22241411414222).

The spelling of 21221201202010 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, two hundred two thousand, ten".