2215110166521 has 48 divisors (see below), whose sum is σ = 3512310932736. Its totient is φ = 1237599385344.

The previous prime is 2215110166519. The next prime is 2215110166573. The reversal of 2215110166521 is 1256610115122.

It is a happy number.

It is not a de Polignac number, because 2215110166521 - 2¹ = 2215110166519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2215110166501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6727485 + ... + 7049061.

It is an arithmetic number, because the mean of its divisors is an integer number (73173144432).

Almost surely, 2^{2215110166521} is an apocalyptic number.

2215110166521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2215110166521 is a deficient number, since it is larger than the sum of its proper divisors (1297200766215).

2215110166521 is a wasteful number, since it uses less digits than its factorization.

2215110166521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322638 (or 322631 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 2215110166521 in words is "two trillion, two hundred fifteen billion, one hundred ten million, one hundred sixty-six thousand, five hundred twenty-one".