21134542120 has 32 divisors (see below), whose sum is σ = 50349940200. Its totient is φ = 7956533248.

The previous prime is 21134542111. The next prime is 21134542127. The reversal of 21134542120 is 2124543112.

It can be written as a sum of positive squares in 4 ways, for example, as 19970777124 + 1163764996 = 141318^2 + 34114^2 .

It is not an unprimeable number, because it can be changed into a prime (21134542127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15539425 + ... + 15540784.

Almost surely, 2^21134542120 is an apocalyptic number.

21134542120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21134542120 is an abundant number, since it is smaller than the sum of its proper divisors (29215398080).

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

21134542120 is a wasteful number, since it uses less digits than its factorization.

21134542120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31080237 (or 31080233 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 21134542120 in words is "twenty-one billion, one hundred thirty-four million, five hundred forty-two thousand, one hundred twenty".