1220212123 has 16 divisors (see below), whose sum is σ = 1374762816. Its totient is φ = 1074585600.

The previous prime is 1220212121. The next prime is 1220212171. The reversal of 1220212123 is 3212120221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1220212123 - 2¹ = 1220212121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220212097 and 1220212106.

It is not an unprimeable number, because it can be changed into a prime (1220212121) 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, 114811 + ... + 124987.

It is an arithmetic number, because the mean of its divisors is an integer number (85922676).

Almost surely, 2^1220212123 is an apocalyptic number.

1220212123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1220212123 is a deficient number, since it is larger than the sum of its proper divisors (154550693).

1220212123 is a wasteful number, since it uses less digits than its factorization.

1220212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10614.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220212123 is about 34931.5347930777. The cubic root of 1220212123 is about 1068.5916554485.

Adding to 1220212123 its reverse (3212120221), we get a palindrome (4432332344).

The spelling of 1220212123 in words is "one billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-three".