402023020251 has 16 divisors (see below), whose sum is σ = 567504368640. Its totient is φ = 252441586080.

The previous prime is 402023020249. The next prime is 402023020309. The reversal of 402023020251 is 152020320204.

It is not a de Polignac number, because 402023020251 - 2¹ = 402023020249 is a prime.

It is a super-2 number, since 2×402023020251² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402023020241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20374635 + ... + 20394356.

It is an arithmetic number, because the mean of its divisors is an integer number (35469023040).

Almost surely, 2^402023020251 is an apocalyptic number.

402023020251 is a deficient number, since it is larger than the sum of its proper divisors (165481348389).

402023020251 is a wasteful number, since it uses less digits than its factorization.

402023020251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40769186.

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 402023020251 its reverse (152020320204), we get a palindrome (554043340455).

The spelling of 402023020251 in words is "four hundred two billion, twenty-three million, twenty thousand, two hundred fifty-one".