21151045454 has 64 divisors (see below), whose sum is σ = 40854730752. Its totient is φ = 7973532000.

The previous prime is 21151045451. The next prime is 21151045457. The reversal of 21151045454 is 45454015112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21151045451) and next prime (21151045457).

It is a super-2 number, since 2×21151045454² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21151045454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151045451) 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, 693629 + ... + 723479.

It is an arithmetic number, because the mean of its divisors is an integer number (638355168).

Almost surely, 2^21151045454 is an apocalyptic number.

21151045454 is a deficient number, since it is larger than the sum of its proper divisors (19703685298).

21151045454 is a wasteful number, since it uses less digits than its factorization.

21151045454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30021.

The product of its (nonzero) digits is 16000, while the sum is 32.

The spelling of 21151045454 in words is "twenty-one billion, one hundred fifty-one million, forty-five thousand, four hundred fifty-four".