1522016021 has 4 divisors (see below), whose sum is σ = 1571113344. Its totient is φ = 1472918700.

The previous prime is 1522016017. The next prime is 1522016029. The reversal of 1522016021 is 1206102251.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1206102251 = 3881 ⋅310771.

It is a cyclic number.

It is not a de Polignac number, because 1522016021 - 2² = 1522016017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1522015984 and 1522016002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1522016029) 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, 24548615 + ... + 24548676.

It is an arithmetic number, because the mean of its divisors is an integer number (392778336).

Almost surely, 2^1522016021 is an apocalyptic number.

It is an amenable number.

1522016021 is a deficient number, since it is larger than the sum of its proper divisors (49097323).

1522016021 is an equidigital number, since it uses as much as digits as its factorization.

1522016021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49097322.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1522016021 is about 39013.0237356706. The cubic root of 1522016021 is about 1150.2875200435.

Adding to 1522016021 its reverse (1206102251), we get a palindrome (2728118272).

The spelling of 1522016021 in words is "one billion, five hundred twenty-two million, sixteen thousand, twenty-one".