20211123402 has 20 divisors (see below), whose sum is σ = 45287887986. Its totient is φ = 6737041080.

The previous prime is 20211123391. The next prime is 20211123437. The reversal of 20211123402 is 20432111202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19312382961 + 898740441 = 138969^2 + 29979^2 .

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 9 ways as a sum of consecutive naturals, for example, 62379849 + ... + 62380172.

Almost surely, 2^20211123402 is an apocalyptic number.

20211123402 is an abundant number, since it is smaller than the sum of its proper divisors (25076764584).

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

20211123402 is a wasteful number, since it uses less digits than its factorization.

20211123402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124760035 (or 124760026 counting only the distinct ones).

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

Adding to 20211123402 its reverse (20432111202), we get a palindrome (40643234604).

The spelling of 20211123402 in words is "twenty billion, two hundred eleven million, one hundred twenty-three thousand, four hundred two".