13351212021 has 16 divisors (see below), whose sum is σ = 21541451904. Its totient is φ = 7180483584.

The previous prime is 13351212013. The next prime is 13351212023. The reversal of 13351212021 is 12021215331.

It is not a de Polignac number, because 13351212021 - 2³ = 13351212013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13351212023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18698820 + ... + 18699533.

It is an arithmetic number, because the mean of its divisors is an integer number (1346340744).

Almost surely, 2^13351212021 is an apocalyptic number.

It is an amenable number.

13351212021 is a deficient number, since it is larger than the sum of its proper divisors (8190239883).

13351212021 is a wasteful number, since it uses less digits than its factorization.

13351212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37398380.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 13351212021 its reverse (12021215331), we get a palindrome (25372427352).

The spelling of 13351212021 in words is "thirteen billion, three hundred fifty-one million, two hundred twelve thousand, twenty-one".