1421221015 has 16 divisors (see below), whose sum is σ = 1743648768. Its totient is φ = 1111574176.

The previous prime is 1421220959. The next prime is 1421221057. The reversal of 1421221015 is 5101221241.

It is a cyclic number.

It is not a de Polignac number, because 1421221015 - 2¹⁵ = 1421188247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1421220983 and 1421221001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256464 + ... + 261946.

It is an arithmetic number, because the mean of its divisors is an integer number (108978048).

Almost surely, 2^1421221015 is an apocalyptic number.

1421221015 is a deficient number, since it is larger than the sum of its proper divisors (322427753).

1421221015 is a wasteful number, since it uses less digits than its factorization.

1421221015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1421221015 is about 37699.0850684735. The cubic root of 1421221015 is about 1124.3129342219.

Adding to 1421221015 its reverse (5101221241), we get a palindrome (6522442256).

The spelling of 1421221015 in words is "one billion, four hundred twenty-one million, two hundred twenty-one thousand, fifteen".