1980021123 has 12 divisors (see below), whose sum is σ = 2920882848. Its totient is φ = 1291928400.

The previous prime is 1980021107. The next prime is 1980021163. The reversal of 1980021123 is 3211200891.

It is not a de Polignac number, because 1980021123 - 2⁴ = 1980021107 is a prime.

It is a super-2 number, since 2×1980021123² = 7840967295052362258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1980021163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2340028 + ... + 2340873.

It is an arithmetic number, because the mean of its divisors is an integer number (243406904).

Almost surely, 2^1980021123 is an apocalyptic number.

1980021123 is a deficient number, since it is larger than the sum of its proper divisors (940861725).

1980021123 is a wasteful number, since it uses less digits than its factorization.

1980021123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680954 (or 4680951 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1980021123 is about 44497.4282740025. The cubic root of 1980021123 is about 1255.7117009990.

The spelling of 1980021123 in words is "one billion, nine hundred eighty million, twenty-one thousand, one hundred twenty-three".