10212220561566 has 64 divisors (see below), whose sum is σ = 22044585715200. Its totient is φ = 3143910796416.

The previous prime is 10212220561531. The next prime is 10212220561567. The reversal of 10212220561566 is 66516502221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212220561567) 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, 4434226 + ... + 6331413.

It is an arithmetic number, because the mean of its divisors is an integer number (344446651800).

Almost surely, 2^{10212220561566} is an apocalyptic number.

10212220561566 is an abundant number, since it is smaller than the sum of its proper divisors (11832365153634).

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

10212220561566 is a wasteful number, since it uses less digits than its factorization.

10212220561566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10765873.

The product of its (nonzero) digits is 86400, while the sum is 39.

Adding to 10212220561566 its reverse (66516502221201), we get a palindrome (76728722782767).

The spelling of 10212220561566 in words is "ten trillion, two hundred twelve billion, two hundred twenty million, five hundred sixty-one thousand, five hundred sixty-six".