29121278020 has 24 divisors (see below), whose sum is σ = 62455849344. Its totient is φ = 11400670176.

The previous prime is 29121278009. The next prime is 29121278027. The reversal of 29121278020 is 2087212192.

It is not an unprimeable number, because it can be changed into a prime (29121278027) 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, 15489102 + ... + 15490981.

It is an arithmetic number, because the mean of its divisors is an integer number (2602327056).

Almost surely, 2^29121278020 is an apocalyptic number.

29121278020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

29121278020 is an abundant number, since it is smaller than the sum of its proper divisors (33334571324).

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

29121278020 is a wasteful number, since it uses less digits than its factorization.

29121278020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30980139 (or 30980137 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 29121278020 in words is "twenty-nine billion, one hundred twenty-one million, two hundred seventy-eight thousand, twenty".