220887791802821 has 16 divisors (see below), whose sum is σ = 274769511484608. Its totient is φ = 174456832684800.

The previous prime is 220887791802653. The next prime is 220887791802869. The reversal of 220887791802821 is 128208197788022.

It is a cyclic number.

It is not a de Polignac number, because 220887791802821 - 2³⁴ = 220870611933637 is a prime.

It is a super-2 number, since 2×220887791802821² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220887791802221) 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, 45431464415 + ... + 45431469276.

It is an arithmetic number, because the mean of its divisors is an integer number (17173094467788).

Almost surely, 2^{220887791802821} is an apocalyptic number.

It is an amenable number.

220887791802821 is a deficient number, since it is larger than the sum of its proper divisors (53881719681787).

220887791802821 is a wasteful number, since it uses less digits than its factorization.

220887791802821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90862933732.

The product of its (nonzero) digits is 28901376, while the sum is 65.

The spelling of 220887791802821 in words is "two hundred twenty trillion, eight hundred eighty-seven billion, seven hundred ninety-one million, eight hundred two thousand, eight hundred twenty-one".