1221402134 has 8 divisors (see below), whose sum is σ = 1835064840. Its totient is φ = 609713856.

The previous prime is 1221402073. The next prime is 1221402157. The reversal of 1221402134 is 4312041221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492059 + ... + 494534.

It is an arithmetic number, because the mean of its divisors is an integer number (229383105).

Almost surely, 2^1221402134 is an apocalyptic number.

1221402134 is a deficient number, since it is larger than the sum of its proper divisors (613662706).

1221402134 is an equidigital number, since it uses as much as digits as its factorization.

1221402134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987214.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1221402134 is about 34948.5641192882. The cubic root of 1221402134 is about 1068.9389236644.

Adding to 1221402134 its reverse (4312041221), we get a palindrome (5533443355).

The spelling of 1221402134 in words is "one billion, two hundred twenty-one million, four hundred two thousand, one hundred thirty-four".