23011221402 has 24 divisors (see below), whose sum is σ = 53692850484. Its totient is φ = 7080375744.

The previous prime is 23011221391. The next prime is 23011221413. The reversal of 23011221402 is 20412211032.

It is a happy number.

23011221402 is a `hidden beast` number, since 2 + 30 + 11 + 221 + 402 = 666.

It is an interprime number because it is at equal distance from previous prime (23011221391) and next prime (23011221413).

It can be written as a sum of positive squares in 2 ways, for example, as 18122275161 + 4888946241 = 134619^2 + 69921^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49169043 + ... + 49169510.

Almost surely, 2^23011221402 is an apocalyptic number.

23011221402 is an abundant number, since it is smaller than the sum of its proper divisors (30681629082).

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

23011221402 is a wasteful number, since it uses less digits than its factorization.

23011221402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98338574 (or 98338571 counting only the distinct ones).

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

Adding to 23011221402 its reverse (20412211032), we get a palindrome (43423432434).

The spelling of 23011221402 in words is "twenty-three billion, eleven million, two hundred twenty-one thousand, four hundred two".