1221421350 has 24 divisors (see below), whose sum is σ = 3029125320. Its totient is φ = 325712320.

The previous prime is 1221421343. The next prime is 1221421367. The reversal of 1221421350 is 531241221.

It is a super-2 number, since 2×1221421350² = 2983740228471645000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4071255 + ... + 4071554.

It is an arithmetic number, because the mean of its divisors is an integer number (126213555).

Almost surely, 2^1221421350 is an apocalyptic number.

1221421350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221421350 is an abundant number, since it is smaller than the sum of its proper divisors (1807703970).

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

1221421350 is a wasteful number, since it uses less digits than its factorization.

1221421350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8142824 (or 8142819 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1221421350 is about 34948.8390365116. The cubic root of 1221421350 is about 1068.9445294138.

Adding to 1221421350 its reverse (531241221), we get a palindrome (1752662571).

The spelling of 1221421350 in words is "one billion, two hundred twenty-one million, four hundred twenty-one thousand, three hundred fifty".