221992356851 has 2 divisors, whose sum is σ = 221992356852. Its totient is φ = 221992356850.

The previous prime is 221992356841. The next prime is 221992356877. The reversal of 221992356851 is 158653299122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221992356851 - 2¹⁸ = 221992094707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221992356793 and 221992356802.

It is not a weakly prime, because it can be changed into another prime (221992356841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110996178425 + 110996178426.

It is an arithmetic number, because the mean of its divisors is an integer number (110996178426).

Almost surely, 2^221992356851 is an apocalyptic number.

221992356851 is a deficient number, since it is larger than the sum of its proper divisors (1).

221992356851 is an equidigital number, since it uses as much as digits as its factorization.

221992356851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 53.

The spelling of 221992356851 in words is "two hundred twenty-one billion, nine hundred ninety-two million, three hundred fifty-six thousand, eight hundred fifty-one".