1421664023 has 4 divisors (see below), whose sum is σ = 1531022808. Its totient is φ = 1312305240.

The previous prime is 1421664011. The next prime is 1421664031. The reversal of 1421664023 is 3204661241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1421664023 - 2¹² = 1421659927 is a prime.

It is a super-2 number, since 2×1421664023² = 4042257188585089058, 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 (1421664043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54679373 + ... + 54679398.

It is an arithmetic number, because the mean of its divisors is an integer number (382755702).

Almost surely, 2^1421664023 is an apocalyptic number.

1421664023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1421664023 is a deficient number, since it is larger than the sum of its proper divisors (109358785).

1421664023 is a wasteful number, since it uses less digits than its factorization.

1421664023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109358784.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1421664023 is about 37704.9601909351. The cubic root of 1421664023 is about 1124.4297417360.

The spelling of 1421664023 in words is "one billion, four hundred twenty-one million, six hundred sixty-four thousand, twenty-three".