21142120389 has 32 divisors (see below), whose sum is σ = 30557184000. Its totient is φ = 12925344960.

The previous prime is 21142120387. The next prime is 21142120411. The reversal of 21142120389 is 98302124112.

It is not a de Polignac number, because 21142120389 - 2¹ = 21142120387 is a prime.

It is a super-2 number, since 2×21142120389² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142120387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6292492 + ... + 6295850.

It is an arithmetic number, because the mean of its divisors is an integer number (954912000).

Almost surely, 2^21142120389 is an apocalyptic number.

It is an amenable number.

21142120389 is a deficient number, since it is larger than the sum of its proper divisors (9415063611).

21142120389 is a wasteful number, since it uses less digits than its factorization.

21142120389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385.

The product of its (nonzero) digits is 6912, while the sum is 33.

The spelling of 21142120389 in words is "twenty-one billion, one hundred forty-two million, one hundred twenty thousand, three hundred eighty-nine".