221004215121210 has 64 divisors (see below), whose sum is σ = 531238087768320. Its totient is φ = 58842465881600.

The previous prime is 221004215121097. The next prime is 221004215121233. The reversal of 221004215121210 is 12121512400122.

It is a super-4 number, since 4×221004215121210⁴ (a number of 58 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 748209931 + ... + 748505249.

It is an arithmetic number, because the mean of its divisors is an integer number (8300595121380).

Almost surely, 2^{221004215121210} is an apocalyptic number.

221004215121210 is an abundant number, since it is smaller than the sum of its proper divisors (310233872647110).

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

221004215121210 is a wasteful number, since it uses less digits than its factorization.

221004215121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334183.

The product of its (nonzero) digits is 640, while the sum is 24.

Adding to 221004215121210 its reverse (12121512400122), we get a palindrome (233125727521332).

The spelling of 221004215121210 in words is "two hundred twenty-one trillion, four billion, two hundred fifteen million, one hundred twenty-one thousand, two hundred ten".