20210122142 has 16 divisors (see below), whose sum is σ = 34647782400. Its totient is φ = 8661016248.

The previous prime is 20210122139. The next prime is 20210122157. The reversal of 20210122142 is 24122101202.

It is a self number, because there is not a number n which added to its sum of digits gives 20210122142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414359 + ... + 460557.

It is an arithmetic number, because the mean of its divisors is an integer number (2165486400).

Almost surely, 2^20210122142 is an apocalyptic number.

20210122142 is a deficient number, since it is larger than the sum of its proper divisors (14437660258).

20210122142 is a wasteful number, since it uses less digits than its factorization.

20210122142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77455.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20210122142 its reverse (24122101202), we get a palindrome (44332223344).

The spelling of 20210122142 in words is "twenty billion, two hundred ten million, one hundred twenty-two thousand, one hundred forty-two".