1212023421 has 12 divisors (see below), whose sum is σ = 2000800672. Its totient is φ = 692584776.

The previous prime is 1212023411. The next prime is 1212023431. The reversal of 1212023421 is 1243202121.

It is a happy number.

1212023421 is a `hidden beast` number, since 121 + 202 + 342 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1212023411) and next prime (1212023431).

It is not a de Polignac number, because 1212023421 - 2⁵ = 1212023389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212023394 and 1212023403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212023411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9619171 + ... + 9619296.

Almost surely, 2^1212023421 is an apocalyptic number.

It is an amenable number.

1212023421 is a deficient number, since it is larger than the sum of its proper divisors (788777251).

1212023421 is a wasteful number, since it uses less digits than its factorization.

1212023421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19238480 (or 19238477 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1212023421 is about 34814.1267447569. The cubic root of 1212023421 is about 1066.1958899840.

Adding to 1212023421 its reverse (1243202121), we get a palindrome (2455225542).

The spelling of 1212023421 in words is "one billion, two hundred twelve million, twenty-three thousand, four hundred twenty-one".