21451544542030 has 32 divisors (see below), whose sum is σ = 38757695518080. Its totient is φ = 8548418384640.

The previous prime is 21451544541991. The next prime is 21451544542031. The reversal of 21451544542030 is 3024544515412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451544542031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44412466 + ... + 44892874.

It is an arithmetic number, because the mean of its divisors is an integer number (1211177984940).

Almost surely, 2^{21451544542030} is an apocalyptic number.

21451544542030 is a deficient number, since it is larger than the sum of its proper divisors (17306150976050).

21451544542030 is a wasteful number, since it uses less digits than its factorization.

21451544542030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497164.

The product of its (nonzero) digits is 384000, while the sum is 40.

The spelling of 21451544542030 in words is "twenty-one trillion, four hundred fifty-one billion, five hundred forty-four million, five hundred forty-two thousand, thirty".