1211420403 has 12 divisors (see below), whose sum is σ = 1751633208. Its totient is φ = 806781120.

The previous prime is 1211420383. The next prime is 1211420407. The reversal of 1211420403 is 3040241121.

1211420403 is a `hidden beast` number, since 121 + 142 + 0 + 403 = 666.

It is not a de Polignac number, because 1211420403 - 2⁶ = 1211420339 is a prime.

It is a super-3 number, since 3×1211420403³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1211420407) 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, 60093 + ... + 77678.

It is an arithmetic number, because the mean of its divisors is an integer number (145969434).

Almost surely, 2^1211420403 is an apocalyptic number.

1211420403 is a deficient number, since it is larger than the sum of its proper divisors (540212805).

1211420403 is a wasteful number, since it uses less digits than its factorization.

1211420403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138754 (or 138751 counting only the distinct ones).

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

The square root of 1211420403 is about 34805.4651312118. The cubic root of 1211420403 is about 1066.0190391746.

Adding to 1211420403 its reverse (3040241121), we get a palindrome (4251661524).

The spelling of 1211420403 in words is "one billion, two hundred eleven million, four hundred twenty thousand, four hundred three".