29012121001 has 16 divisors (see below), whose sum is σ = 32229508608. Its totient is φ = 25991481600.

The previous prime is 29012120999. The next prime is 29012121011. The reversal of 29012121001 is 10012121092.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 29012121001 - 2¹ = 29012120999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29012121001.

It is not an unprimeable number, because it can be changed into a prime (29012121011) 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, 419095 + ... + 483388.

It is an arithmetic number, because the mean of its divisors is an integer number (2014344288).

Almost surely, 2^29012121001 is an apocalyptic number.

It is an amenable number.

29012121001 is a deficient number, since it is larger than the sum of its proper divisors (3217387607).

29012121001 is a wasteful number, since it uses less digits than its factorization.

29012121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902592.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 29012121001 its reverse (10012121092), we get a palindrome (39024242093).

The spelling of 29012121001 in words is "twenty-nine billion, twelve million, one hundred twenty-one thousand, one".