1495216921 has 4 divisors (see below), whose sum is σ = 1631145744. Its totient is φ = 1359288100.

The previous prime is 1495216897. The next prime is 1495216939. The reversal of 1495216921 is 1296125941.

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 1495216921 - 2⁵ = 1495216889 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1495216321) 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, 67964395 + ... + 67964416.

It is an arithmetic number, because the mean of its divisors is an integer number (407786436).

Almost surely, 2^1495216921 is an apocalyptic number.

1495216921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1495216921 is a deficient number, since it is larger than the sum of its proper divisors (135928823).

1495216921 is a wasteful number, since it uses less digits than its factorization.

1495216921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135928822.

The product of its digits is 38880, while the sum is 40.

The square root of 1495216921 is about 38668.0348737817. The cubic root of 1495216921 is about 1143.4962228480.

The spelling of 1495216921 in words is "one billion, four hundred ninety-five million, two hundred sixteen thousand, nine hundred twenty-one".