29972146421 has 16 divisors (see below), whose sum is σ = 35033579520. Its totient is φ = 25107228720.

The previous prime is 29972146409. The next prime is 29972146447. The reversal of 29972146421 is 12464127992.

It is a happy number.

It is not a de Polignac number, because 29972146421 - 2¹⁰ = 29972145397 is a prime.

It is a super-2 number, since 2×29972146421² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29972146921) 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, 161420 + ... + 293258.

It is an arithmetic number, because the mean of its divisors is an integer number (2189598720).

Almost surely, 2^29972146421 is an apocalyptic number.

It is an amenable number.

29972146421 is a deficient number, since it is larger than the sum of its proper divisors (5061433099).

29972146421 is a wasteful number, since it uses less digits than its factorization.

29972146421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132584.

The product of its digits is 435456, while the sum is 47.

The spelling of 29972146421 in words is "twenty-nine billion, nine hundred seventy-two million, one hundred forty-six thousand, four hundred twenty-one".