16210621051 has 4 divisors (see below), whose sum is σ = 16485377400. Its totient is φ = 15935864704.

The previous prime is 16210621043. The next prime is 16210621067. The reversal of 16210621051 is 15012601261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15012601261 = 7 ⋅2144657323.

It is a cyclic number.

It is not a de Polignac number, because 16210621051 - 2³ = 16210621043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16210621081) 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, 137378086 + ... + 137378203.

It is an arithmetic number, because the mean of its divisors is an integer number (4121344350).

Almost surely, 2^16210621051 is an apocalyptic number.

16210621051 is a deficient number, since it is larger than the sum of its proper divisors (274756349).

16210621051 is an equidigital number, since it uses as much as digits as its factorization.

16210621051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274756348.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 16210621051 in words is "sixteen billion, two hundred ten million, six hundred twenty-one thousand, fifty-one".