21148052397 has 16 divisors (see below), whose sum is σ = 29426984448. Its totient is φ = 13484061360.

The previous prime is 21148052381. The next prime is 21148052449. The reversal of 21148052397 is 79325084112.

It is not a de Polignac number, because 21148052397 - 2⁴ = 21148052381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148052327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 813198 + ... + 838800.

It is an arithmetic number, because the mean of its divisors is an integer number (1839186528).

Almost surely, 2^21148052397 is an apocalyptic number.

It is an amenable number.

21148052397 is a deficient number, since it is larger than the sum of its proper divisors (8278932051).

21148052397 is a wasteful number, since it uses less digits than its factorization.

21148052397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37600.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 21148052397 in words is "twenty-one billion, one hundred forty-eight million, fifty-two thousand, three hundred ninety-seven".