1302212121 has 32 divisors (see below), whose sum is σ = 2106673920. Its totient is φ = 698474496.

The previous prime is 1302211979. The next prime is 1302212123. The reversal of 1302212121 is 1212122031.

It is not a de Polignac number, because 1302212121 - 2¹⁵ = 1302179353 is a prime.

1302212121 is a modest number, since divided by 212121 gives 1302 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1302212121.

It is not an unprimeable number, because it can be changed into a prime (1302212123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134185 + ... + 143561.

It is an arithmetic number, because the mean of its divisors is an integer number (65833560).

Almost surely, 2^1302212121 is an apocalyptic number.

It is an amenable number.

1302212121 is a deficient number, since it is larger than the sum of its proper divisors (804461799).

1302212121 is a wasteful number, since it uses less digits than its factorization.

1302212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9793.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1302212121 is about 36086.1763144836. The cubic root of 1302212121 is about 1092.0115817782.

Adding to 1302212121 its reverse (1212122031), we get a palindrome (2514334152).

The spelling of 1302212121 in words is "one billion, three hundred two million, two hundred twelve thousand, one hundred twenty-one".