402121012211 has 4 divisors (see below), whose sum is σ = 404784065424. Its totient is φ = 399457959000.

The previous prime is 402121012133. The next prime is 402121012217. The reversal of 402121012211 is 112210121204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402121012211 is a prime.

It is a super-2 number, since 2×402121012211² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402121012211.

It is not an unprimeable number, because it can be changed into a prime (402121012217) 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, 1331526380 + ... + 1331526681.

It is an arithmetic number, because the mean of its divisors is an integer number (101196016356).

Almost surely, 2^402121012211 is an apocalyptic number.

402121012211 is a deficient number, since it is larger than the sum of its proper divisors (2663053213).

402121012211 is a wasteful number, since it uses less digits than its factorization.

402121012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663053212.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 402121012211 its reverse (112210121204), we get a palindrome (514331133415).

The spelling of 402121012211 in words is "four hundred two billion, one hundred twenty-one million, twelve thousand, two hundred eleven".