1424661821 has 4 divisors (see below), whose sum is σ = 1554176544. Its totient is φ = 1295147100.

The previous prime is 1424661793. The next prime is 1424661827. The reversal of 1424661821 is 1281664241.

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 1424661821 - 2¹⁸ = 1424399677 is a prime.

It is a super-2 number, since 2×1424661821² = 4059322608430072082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1424661827) 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, 64757345 + ... + 64757366.

It is an arithmetic number, because the mean of its divisors is an integer number (388544136).

Almost surely, 2^1424661821 is an apocalyptic number.

1424661821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1424661821 is a deficient number, since it is larger than the sum of its proper divisors (129514723).

1424661821 is a wasteful number, since it uses less digits than its factorization.

1424661821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129514722.

The product of its digits is 18432, while the sum is 35.

The square root of 1424661821 is about 37744.6926202877. The cubic root of 1424661821 is about 1125.2195314132.

It can be divided in two parts, 14246 and 61821, that added together give a palindrome (76067).

The spelling of 1424661821 in words is "one billion, four hundred twenty-four million, six hundred sixty-one thousand, eight hundred twenty-one".