1466211721 has 24 divisors (see below), whose sum is σ = 1643574240. Its totient is φ = 1306521216.

The previous prime is 1466211697. The next prime is 1466211727. The reversal of 1466211721 is 1271126641.

It is not a de Polignac number, because 1466211721 - 2⁵ = 1466211689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1466211727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 645630 + ... + 647896.

It is an arithmetic number, because the mean of its divisors is an integer number (68482260).

Almost surely, 2^1466211721 is an apocalyptic number.

It is an amenable number.

1466211721 is a deficient number, since it is larger than the sum of its proper divisors (177362519).

1466211721 is a wasteful number, since it uses less digits than its factorization.

1466211721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425 (or 2412 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 1466211721 is about 38291.1441589305. The cubic root of 1466211721 is about 1136.0537920145.

The spelling of 1466211721 in words is "one billion, four hundred sixty-six million, two hundred eleven thousand, seven hundred twenty-one".