1421211636 has 48 divisors (see below), whose sum is σ = 3968059200. Its totient is φ = 437295456.

The previous prime is 1421211601. The next prime is 1421211637. The reversal of 1421211636 is 6361121241.

It is a happy number.

1421211636 is a `hidden beast` number, since 1 + 4 + 2 + 1 + 21 + 1 + 636 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421211637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504726 + ... + 507533.

It is an arithmetic number, because the mean of its divisors is an integer number (82667900).

Almost surely, 2^1421211636 is an apocalyptic number.

It is an amenable number.

1421211636 is an abundant number, since it is smaller than the sum of its proper divisors (2546847564).

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

1421211636 is a wasteful number, since it uses less digits than its factorization.

1421211636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012285 (or 1012277 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1421211636 is about 37698.9606753290. The cubic root of 1421211636 is about 1124.3104610072.

Adding to 1421211636 its reverse (6361121241), we get a palindrome (7782332877).

The spelling of 1421211636 in words is "one billion, four hundred twenty-one million, two hundred eleven thousand, six hundred thirty-six".