1212921438 has 32 divisors (see below), whose sum is σ = 2545170432. Its totient is φ = 384847200.

The previous prime is 1212921403. The next prime is 1212921443. The reversal of 1212921438 is 8341292121.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1212921399 and 1212921408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42106 + ... + 64797.

It is an arithmetic number, because the mean of its divisors is an integer number (79536576).

Almost surely, 2^1212921438 is an apocalyptic number.

1212921438 is an abundant number, since it is smaller than the sum of its proper divisors (1332248994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212921438 is a wasteful number, since it uses less digits than its factorization.

1212921438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107000.

The product of its digits is 6912, while the sum is 33.

The square root of 1212921438 is about 34827.0216642193. The cubic root of 1212921438 is about 1066.4591482804.

The spelling of 1212921438 in words is "one billion, two hundred twelve million, nine hundred twenty-one thousand, four hundred thirty-eight".