20231211402 has 48 divisors (see below), whose sum is σ = 45535089600. Its totient is φ = 6732268992.

The previous prime is 20231211367. The next prime is 20231211409. The reversal of 20231211402 is 20411213202.

It is a happy number.

20231211402 is a `hidden beast` number, since 20 + 2 + 31 + 211 + 402 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20231211409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253099 + ... + 323297.

It is an arithmetic number, because the mean of its divisors is an integer number (948647700).

Almost surely, 2^20231211402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20231211402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22767544800).

20231211402 is an abundant number, since it is smaller than the sum of its proper divisors (25303878198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20231211402 is an equidigital number, since it uses as much as digits as its factorization.

20231211402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70809 (or 70797 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20231211402 its reverse (20411213202), we get a palindrome (40642424604).

The spelling of 20231211402 in words is "twenty billion, two hundred thirty-one million, two hundred eleven thousand, four hundred two".