1242921361 has 4 divisors (see below), whose sum is σ = 1355914224. Its totient is φ = 1129928500.

The previous prime is 1242921359. The next prime is 1242921373. The reversal of 1242921361 is 1631292421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242921361 - 2¹ = 1242921359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242921331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56496415 + ... + 56496436.

It is an arithmetic number, because the mean of its divisors is an integer number (338978556).

Almost surely, 2^1242921361 is an apocalyptic number.

1242921361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1242921361 is a deficient number, since it is larger than the sum of its proper divisors (112992863).

1242921361 is a wasteful number, since it uses less digits than its factorization.

1242921361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112992862.

The product of its digits is 5184, while the sum is 31.

The square root of 1242921361 is about 35255.0898594799. The cubic root of 1242921361 is about 1075.1800991928.

The spelling of 1242921361 in words is "one billion, two hundred forty-two million, nine hundred twenty-one thousand, three hundred sixty-one".